Metastin derivatives and use thereof

ABSTRACT

The present invention provides stable metastin derivatives having excellent biological activities (a cancer metastasis suppressing activity, a cancer growth suppressing activity, a gonadotropic hormone secretion stimulating activity, sex hormone secretion stimulating activity, etc.). 
     By substituting the constituent amino acids of metastin with specific amino acids, the metastin derivatives of the present invention achieve more improved blood stability, solubility, etc., reduced gelation tendency, improved pharmacokinetics, as well as exhibit an excellent cancer metastasis suppressing activity or a cancer growth suppressing activity. The metastin derivatives of the present invention also have a gonadotropic hormone secretion suppressing activity, sex hormone secretion suppressing activity, etc.

TECHNICAL FIELD

The present invention relates to metastin derivatives and use thereof.

BACKGROUND OF THE INVENTION

Human-derived metastin (also called KiSS-1 peptide) (WO00/24890) and mouse or rat-derived metastin (WO01/75104) are known. Sustained release preparations containing metastin are also known (WO02/85399).

Reportedly, metastin has an effect of suppressing cancer metastasis and is thus effective for preventing/treating cancers (for example, lung cancer, gastric cancer, liver cancer, pancreatic cancer, colorectal cancer, rectal cancer, colonic cancer, prostate cancer, ovarian cancer, cervical cancer, breast cancer, renal cancer, bladder cancer, brain tumor, etc.); metastin also has an effect of controlling the pancreatic function and is effective for preventing/treating pancreatic diseases (e.g., acute or chronic pancreatitis, pancreatic cancer, etc.); and metastin further has an effect of controlling placental function and is effective for preventing/treating choriocarcinoma, hydatidiform mole, invasive mole, miscarriage, fetal hypoplasia, abnormal glucose metabolism, abnormal lipid metabolism or abnormal delivery (WO00/24890, WO01/75104, WO02/85399).

DISCLOSURE OF THE INVENTION

The present invention aims at providing stable metastin derivatives having excellent biological activities (a cancer metastasis suppressing activity, a cancer growth suppressing activity, a gonadotropic hormone secretion stimulating activity, sex hormone secretion stimulating activity, a gonadotropic hormone secretion suppressing activity, sex hormone secretion suppressing activity, etc.)

The present inventors have made extensive studies to solve the foregoing problems and as a result, have found that by substituting the constituent amino acids of metastin with specific amino acids, unexpectedly blood stability, solubility, etc. are more improved, gelation tendency is reduced, pharmacokinetics are also improved, and an excellent cancer metastasis suppressing activity or a cancer growth suppressing activity is exhibited. The present inventors have further found that unexpectedly these metastin derivatives have an effect of suppressing the gonadotropic hormone secretion, an effect of suppressing the sex hormone secretion, etc., which are totally different from the effects known so far. Based on these findings, the present inventors have continued further investigations and come to accomplish the present invention.

That is, the present invention provides the following features, and so on.

[1] A metastin derivative represented by the formula below, or a salt thereof:

(wherein:

V′ represents a group represented by formula:

n represents 0 or 1;

W¹ represents N, CH or O (provided that when W¹ is N or CH, n represents 1 and when W¹ is O, n represents 0);

W² represents N or CH;

each of Z¹, Z⁵ and Z⁷ represents hydrogen atom or a C₁₋₃ alkyl group;

each of Z², Z⁴, Z⁶ and Z⁸ represents hydrogen atom, O or S;

R¹ represents (1) hydrogen atom, (2) a C₁₋₈ alkyl group optionally substituted with a substituent selected from the group consisting of an optionally substituted carbamoyl group, an optionally substituted hydroxyl group and an optionally substituted aromatic cyclic group, (3) a cyclic or linear C₁₋₁₀ alkyl group, (4) a C₁₋₁₀ alkyl group consisting of a cyclic alkyl group and a linear alkyl group or (5) an optionally substituted aromatic cyclic group;

R² represents (1) hydrogen atom or (2) a cyclic or linear C₁₋₁₀ alkyl group, (3) a C₁₋₁₀ alkyl group consisting of a cyclic alkyl group and a linear alkyl group, or (4) a C₁₋₈ alkyl group optionally substituted with a substituent selected from the group consisting of an optionally substituted carbamoyl group, an optionally substituted hydroxyl group and an optionally substituted aromatic cyclic group;

R³ represents (1) a C₁₋₈ alkyl group having an optionally substituted basic group and optionally having an additional substituent, (2) an aralkyl group having an optionally substituted basic group and optionally having an additional substituent, (3) a C₁₋₄ alkyl group having a non-aromatic cyclic hydrocarbon group of carbon atoms not greater than 7 having an optionally substituted basic group, and optionally having an additional substituent, or (4) a C₁₋₄ alkyl group having a non-aromatic heterocyclic group of carbon atoms not greater than 7 having an optionally substituted basic group and optionally having an additional substituent;

R⁴ represents a C₁₋₄ alkyl group, which may optionally be substituted with a substituent selected from the group consisting of: (1) an optionally substituted C₆₋₁₂ aromatic hydrocarbon group, (2) an optionally substituted 5- to 14-membered aromatic heterocyclic group consisting of 1 to 7 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms, (3) an optionally substituted C₈₋₁₄ aromatic fused-ring group, (4) an optionally substituted 5- to 14-membered aromatic fused heterocyclic group consisting of 3 to 11 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms,

(5) an optionally substituted non-aromatic cyclic hydrocarbon group having carbon atoms not greater than 7, and, (6) an optionally substituted non-aromatic heterocyclic group having carbon atoms not greater than 7;

Q¹ represents a C₁₋₄ alkyl group, which may optionally be substituted with a substituent selected from the group consisting of: (1) an optionally substituted C₆₋₁₂ aromatic hydrocarbon group, (2) an optionally substituted 5- to 14-membered aromatic heterocyclic group consisting of 1 to 7 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms, (3) an optionally substituted C₈₋₁₄ aromatic fused-ring group, (4) an optionally substituted 5- to 14-membered aromatic fused heterocyclic group consisting of 3 to 11 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms, (5) an optionally substituted non-aromatic cyclic hydrocarbon group having carbon atoms not greater than 7, and (6) an optionally substituted non-aromatic heterocyclic group having carbon atoms not greater than 7;

A represents:

-   (1) a nitrogen atom substituted with hydrogen atom or a C₁₋₃ alkyl     group; -   (2) a carbon atom substituted with hydrogen atom or a C₁₋₃ alkyl     group; -   (3) O; or -   (4) S;

A′ represents:

-   (1) a carbon atom, which may optionally be substituted with hydrogen     atom, O, S, a halogen atom, an optionally halogenated C₁₋₃ alkyl     group, carbamoyl group or hydroxyl group; -   (2) a nitrogen atom, which may optionally be substituted with     hydrogen atom or an optionally halogenated C₁₋₃ alkyl group; -   (3) O; or -   (4) S;

Q² represents:

-   (1) CH₂, CO, CS or CH═CH₂, which may optionally be substituted with     one or two C₀₋₄ alkyl groups optionally substituted with a     substituent selected from the group consisting of carbamoyl group,     hydroxyl group, a C₁₋₃ alkoxy group, a halogen atom and an amino     group; -   (2) NH, which may optionally be substituted with a substituent     selected from the group consisting of carbamoyl group and hydroxyl     group; or, -   (3) O;

Y represents:

-   (1) a group represented by formula: -CONH-, -CSNH-, -CH₂NH-, -NHCO-,     -CH₂O-, -COCH₂-, -CH₂S-, -CSCH₂-, -CH₂SO-, -CH₂SO₂-, -COO-, -CSO-,     -CH₂CH₂- or -CH═CH-, which may optionally be substituted with a     substituent selected from the group consisting of a C₁₋₆ alkyl     group, hydroxyl group and a halogen atom; -   (2) an optionally substituted C₆₋₇ aromatic hydrocarbon group; -   (3) an optionally substituted 4- to 7-membered aromatic heterocyclic     group consisting of 1 to 5 carbon atoms and hetero atoms selected     from the group consisting of nitrogen, oxygen and sulfur atoms; -   (4) an optionally substituted non-aromatic cyclic hydrocarbon group     having carbon atoms not greater than 5; or, -   (5) an optionally substituted non-aromatic heterocyclic group having     carbon atoms not greater than 5 and when Y is (2), (3), (4) or (5),     Q² may be a chemical bond.

P and P′, which may be the same or different, each may form a ring by combining P and P′ or P and Q¹ together and represents:

-   (1) hydrogen atom; -   (2) an optional amino acid residue continuously or discontinuously     bound from the C-terminal end of the 1st-48th amino acid sequence in     the amino acid sequence represented by SEQ ID NO: 1; -   (3) a group represented by formula:     J¹-J²-C(J³)(Q³)Y¹C(J⁴)(Q⁴)Y²C(J⁵)(Q⁵)Y³C(J⁶)(Q⁶)C(═Z¹⁰)—

(wherein J¹ represents (a) hydrogen atom or (b) (i) a C₁₋₂₀ acyl group, (ii) a C₁₋₂₀ alkyl group, (iii) a C₆₋₁₄ aryl group, (iv) a carbamoyl group, (v) a carboxyl group, (vi) a sulfino group, (vii) an amidino group, (viii) a glyoxyloyl group or (ix) an amino group, which group may optionally be substituted with a substituent containing an optionally substituted cyclic group; J² represents (1) NH optionally substituted with a C₁₋₆ alkyl group, (2) CH₂ optionally substituted with a C₁₋₆ alkyl group, (3) O or (4) S; each of J³ through J⁶ represents hydrogen atom or a C₁₋₃ alkyl group;

each of Q³ through Q⁶ represents a C₁₋₄ alkyl group, which may optionally be substituted with a substituent selected from the group consisting of:

(1) an optionally substituted C₆₋₁₂ aromatic hydrocarbon group;

(2) an optionally substituted 5- to 14-membered aromatic heterocyclic group consisting of 1 to 7 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms;

(3) an optionally substituted C₈₋₁₄ aromatic fused-ring group;

(4) an optionally substituted 5- to 14-membered aromatic fused heterocyclic group consisting of 3 to 11 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms;

(5) an optionally substituted non-aromatic cyclic hydrocarbon group having carbon atoms not greater than 7;

(6) an optionally substituted non-aromatic heterocyclic group having carbon atoms not greater than 7;

(7) an optionally substituted amino group;

(8) an optionally substituted guanidino group;

(9) an optionally substituted hydroxyl group;

(10) an optionally substituted carboxyl group;

(11) an optionally substituted carbamoyl group; and,

(12) an optionally substituted sulfhydryl group; or hydrogen atom; J³ and Q³, J⁴ and Q⁴, J⁵ and Q⁵ or J⁶ and Q⁶ may be combined together, or Z¹ and R¹, J² and Q³, Y¹ and Q⁴, Y² and Q⁵, or Y³ and Q⁶ may be combined together, to form a ring; Y¹ through Y³ each represents a group represented by formula: -CON(J¹³)-, -CSN(J¹³)-, -C(J¹⁴)N(J¹³)- or -N(J¹³)CO- (wherein J¹³ and J¹⁴ each represents hydrogen atom or a C₁₋₃ alkyl group); and Z¹⁰ represents hydrogen atom, O or S);

-   (4) a group represented by formula:     J¹-J²-C(J⁷)(Q⁷)Y²C(J⁸)(Q⁸)Y³C(J⁹)(Q⁹)C(═Z¹⁰)—(wherein each of J¹ and     J² has the same significance as defined above, J⁷ through J⁹ have     the same significance as given for J³, Q⁷ through Q⁹ have the same     significance as given for Q³, Y² and Y³ have the same significance     as defined above, Z¹⁰ has the same significance as defined above, J⁷     and Q⁷, J⁸ and Q⁸ or J⁹ and Q⁹ may be combined together, or J² and     Q⁷, Y² and Q⁸ or Y³ and Q⁹ may be combined together, to form a     ring.); -   (5) a group represented by formula:     J¹-J²-C(J¹⁰)(Q¹⁰)Y³C(J¹¹)(Q¹¹)C(═Z¹⁰)—(wherein J¹ and J² have the     same significance as defined above, J¹⁰ and J¹¹ have the same     significance as given for J³, Q¹⁰ and Q¹¹ have the same significance     as given for Q³, Y³ has the same significance as defined above, Z¹⁰     has the same significance as defined above, J¹⁰ and Q¹⁰ or J¹¹ and     Q¹¹ may be combined together, or J² and Q¹⁰ or Y³ and Q¹¹ may be     combined together, to form a ring.); -   (6) a group represented by formula:     J¹-J²-C(J¹²)(Q¹²)C(═Z¹⁰)—(wherein, J¹ and J² have the same     significance as defined above, J¹² has the same significance as     given for J³, Q¹² has the same significance as given for Q³, and Z¹⁰     has the same significance as defined above; J¹² and Q¹² may be     combined together, or J² and Q¹² may be combined together, to form a     ring.); or, -   (7) a group represented by formula: J¹- (wherein J¹ has the same     significance as defined above); the bonds between Y-Q², Q²-A′ and     A′-A each independently represents a single or double bond.);     provided that     Ac-D-Tyr-D-Trp-Asn-Thr-PheΨ(CH₂NH)Gly-Leu-Arg(Me)-Trp-NH₂,     Ac-D-Tyr-D-Trp-Asn-Thr-Phe-Gly-Leu-Arg(Me)-Trp-NH₂,     Ac-D-Tyr-D-Trp-Asn-Thr-D-Phe-Gly-Leu-Arg(Me)-Trp-NH2 and     Ac-D-Tyr-D-Trp-Asn-Thr-Phe-Gly-Aib-Arg(Me)-Trp-NH2 are excluded.

[2] The metastin derivative according to [1] or a salt thereof, wherein:

Z¹, Z⁵ and Z⁷ each represents hydrogen atom;

Z², Z⁴, Z⁶ and Z⁸ each represents O;

R¹ represents (2) a C₁₋₈ alkyl group optionally substituted with an optionally substituted hydroxyl group;

R² represents a linear C₁₋₁₀ alkyl group or a C₁₋₁₀ alkyl group consisting of a cyclic alkyl group and a linear alkyl group;

R³ represents (1) a C₁₋₈ alkyl group having an optionally substituted basic group and optionally having an additional substituent;

R⁴ represents (4) a C₁₋₄ alkyl group, which may optionally be substituted with an optionally substituted 5- to 14-membered aromatic fused heterocyclic group consisting of 3 to 11 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms;

Q¹ represents a C₁₋₄ alkyl group, which may optionally be substituted with a substituent selected from the group consisting of (1) an optionally substituted C₆₋₁₂ aromatic hydrocarbon group, (2) an optionally substituted 5- to 14-membered aromatic heterocyclic group consisting of 1 to 7 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms, and (5) an optionally substituted non-aromatic cyclic hydrocarbon group having carbon atoms not greater than 7;

A represents (1) a nitrogen atom substituted with hydrogen atom, (2) a carbon atom substituted with hydrogen atom, or (4) S;

A′ represents (1) a carbon atom substituted with hydrogen atom or O;

Q² represents (1) an optionally substituted CH₂ or CH═CH₂ with one or two C₁₋₄ alkyl groups which may optionally be substituted with a substituent selected from the group consisting of carbamoyl group, hydroxyl group, a C₁₋₃ alkoxy group and an amino group; and,

Y represents (1) a group represented by formula: -CONH-, -CSNH-, -NHCO-, -CH₂O-, -CH₂S-, -COCH₂-, -CH═CH- or -CH₂CH₂-C₁₋₆, which may optionally be substituted with a substituent selected from the group consisting of an alkyl group, hydroxyl group and a halogen group.

[3] A metastin derivative represented by the formula below, or a salt thereof: XX0-XX2-XX3-XX4-XX5-T-XX9-XX10-NH₂ wherein:

XX0 represents formyl, C₁₋₂₀ alkanoyl, cyclopropanecarbonyl, 6-(acetyl-D-arginylamino)caproyl, 6-((R)-2,3-diaminopropionylamino)caproyl, 6-(D-norleucylamino)caproyl, 4-(D-arginylamino)butyryl, 3-(4-hydroxyphenyl)propionyl, glycyl, tyrosyl, acetylglycyl, acetyltyrosyl, D-tyrosyl, acetyl-D-tyrosyl, pyroglutamyl, 3-(pyridin-3-yl)propionyl, adipoyl, glycoloyl or 6-aminocaproyl;

XX2 represents Tyr, D-Tyr, D-Ala, D-Leu, D-Phe, D-Lys, D-Trp or a chemical bond;

XX3 represents D-Asp, D-Dap, D-Ser, D-Gln, D-His, D-NMeAla, D-NMePhe, Aze(2), Pic(2), Pic(3), Hyp, Thz, NMeAla, Gly, Aib, Abz(2), Abz(3), Sar, Leu, Lys, Glu, β-alanine, Pzc(2), Orn, His(3Me), Tyr(PO₃H₂), Pro(4NH₂), Hyp(Bzl), Trp, Pro, 4-pyridylalanine, Tic, D-Trp, D-Ala, D-Leu, D-Phe, D-Lys, D-Glu, D-2-pyridylalanine, D-3-pyridylalanine, D-4-pyridylalanine, Aad, Pro(4F) or a chemical bond;

XX4 represents Asn, 2-amino-3-ureidopropionic acid, N^(β)-formyldiaminopropionic acid, N^(β)-acetyldiaminopropionic acid, N^(ω)-pentylasparagine, N^(ω)-cyclopropylasparagine, N^(ω)-benzylasparagine, 2,4-diaminobutanoic acid, His, Gln, Cit or D-Asn;

XX5 represents Ser, Thr, Val, NMeSer, Gly, Ala, Hyp, D-Ala, Dap or D-Thr;

T represents a group represented by formula II:

Z⁴ represents hydrogen atom, O or S;

R² represents (1) hydrogen atom or (2) a cyclic or linear C₁₋₁₀ alkyl group, (3) a C₁₋₁₀ alkyl group consisting of a cyclic alkyl group and a linear alkyl group, or (4) a C₁₋₈ alkyl group optionally substituted with a substituent selected from the group consisting of an optionally substituted carbamoyl group, an optionally substituted hydroxyl group and an optionally substituted aromatic cyclic group;

Q¹ represents a C₁₋₄ alkyl group, which may optionally be substituted with a substituent selected from the group consisting of (1) an optionally substituted C₆₋₁₂ aromatic hydrocarbon group, (2) an optionally substituted 5- to 14-membered aromatic heterocyclic group consisting of 1 to 7 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms, (3) an optionally substituted C₈₋₁₄ aromatic fused-ring group, (4) an optionally substituted 5- to 14-membered aromatic fused heterocyclic group consisting of 3 to 11 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms, (5) an optionally substituted non-aromatic cyclic hydrocarbon group having carbon atoms not greater than 7 and (6) an optionally substituted non-aromatic heterocyclic group having carbon atoms not greater than 7;

A represents:

-   (1) a nitrogen atom substituted with hydrogen atom or a C₁₋₃ alkyl     group, -   (2) a carbon atom substituted with hydrogen atom or a C₁₋₃ alkyl     group, -   (3) O, or -   (4) S;

A′ represents:

-   (1) a carbon atom, which may optionally be substituted with hydrogen     atom, O, S, a halogen atom, an optionally halogenated C₁₋₃ alkyl     group, carbamoyl group or hydroxyl group, -   (2) a nitrogen atom, which may optionally be substituted with     hydrogen atom or an optionally substituted C₁₋₃ alkyl group, -   (3)O, or, -   (4) S;

Q² represents:

-   (1) CH₂, CO, CS or CH═CH₂, which may optionally be substituted with     a C₀₋₄ alkyl group optionally substituted with a substituent     selected from the group consisting of carbamoyl group, hydroxyl     group, a C₁₋₃ alkoxy group, a halogen atom and an amino group, -   (2) NH, which may optionally be substituted with an optionally     substituted C₁₋₄ alkyl group with a substituent selected from the     group consisting of carbamoyl group and hydroxyl group, or -   (3) O;

Y represents:

-   (1) a group represented by formula: -CONH-, -CSNH-, -CH₂NH-, -NHCO-,     -CH₂O-, -COCH₂-, -CH₂S-, -CSCH₂-, -CH₂SO-, -CH₂SO₂-, -COO-, -CSO-,     -CH₂CH₂- or -CH═CH-, which may optionally be substituted with a     substituent selected from the group consisting of a C₁₋₆ alkyl     group, hydroxyl group and a halogen atom, -   (2) an optionally substituted C₆₋₇ aromatic hydrocarbon group, -   (3) an optionally substituted 4- to 7-membered aromatic heterocyclic     group consisting of 1 to 5 carbon atoms and hetero atoms selected     from the group consisting of nitrogen, oxygen and sulfur atoms, -   (4) an optionally substituted non-aromatic cyclic hydrocarbon group     having carbon atoms not greater than 5, or, -   (5) an optionally substituted non-aromatic cyclic hydrocarbon group     having carbon atoms not greater than 5 and when Y is (2), (3), (4)     or (5), Q² may be a chemical bond;

the bonds between Y-Q², Q²-A′ and A′-A each independently represents a single or double bond;

XX9 represents Arg, Orn, Arg(Me) or Arg(asymMe₂); and,

XX10 represents Phe, Trp, 2-naphthylalanine, 2-thienylalanine, tyrosine or 4-fluorophenylalanine;

provided that Ac-D-Tyr-D-Trp-Asn-Thr-PheΨ(CH₂NH)Gly-Leu-Arg(Me)-Trp-NH₂, Ac-D-Tyr-D-Trp-Asn-Thr-Phe-Gly-Leu-Arg(Me)-Trp-NH₂, Ac-D-Tyr-D-Trp-Asn-Thr-D-Phe-Gly-Leu-Arg(Me)-Trp-NH₂ and Ac-D-Tyr-D-Trp-Asn-Thr-Phe-Gly-Aib-Arg(Me)-Trp-NH₂ are excluded. In the formula “XX0-XX2-XX3-XX4-XX5-T-XX9-XX10-NH₂” described above, each of the bonds “-” between XX0, XX2, XX3, XX4, XX5, T, XX9, XX10 and NH₂ has different significance. For example, the bond “-” between XX0-XX1 denotes the bond between the alkanoyl group and the amino group in XX2; the bonds “-” between XX2-XX3, XX3-XX4, XX4-XX5, XX5-T, T-XX9 and XX9-XX10 normally denote the bond between C═O and NH in the amide bond to connect the adjacent amino acid residues; and the bond “-” between XX10-NH₂ denotes the carbonyl group and the amino group in XX10. That is, in the bond between amino acid residues, the bond denotes the bond between C═O and NH which are the residues of the carboxyl and amino groups provided for the reaction, respectively. Specific examples of the bonds include those shown by the structural formulas in TABLE 1 later described.

[4] The metastin derivative according to [3] or a salt thereof, wherein:

XX0 represents formyl, a C₁₋₆ alkanoyl or glycoloyl;

XX2 represents D-Tyr or a chemical bond;

XX3 represents Aze(2), Hyp, Gly, Aib, Leu, Lys, Glu, His(3Me), Tyr(PO₃H₂), Pro(4F) or Hyp(Bzl);

XX4 represents Asn or 2-amino-3-ureidopropinonic acid;

XX5 represents Ser or Thr;

Z⁴ represents O;

R² represents a linear C₁₋₁₀ alkyl group or a C₁₋₁₀ alkyl group consisting of a cyclic alkyl group and a linear alkyl group;

Q¹ represents a C₁₋₄ alkyl group, which may optionally be substituted with a substituent selected from the group consisting of (1) an optionally substituted C₆₋₁₂ aromatic hydrocarbon group, (2) an optionally substituted 5- to 14-membered aromatic heterocyclic group consisting of 1 to 7 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms, and (5) an optionally substituted non-aromatic cyclic hydrocarbon group having carbon atoms not greater than 7;

A represents (1) a nitrogen atom substituted with hydrogen atom, (2) a carbon atom substituted with hydrogen atom, or (4) S;

A′ represents (1) a carbon atom substituted with hydrogen atom or O;

Q² represents (1) an optionally substituted CH₂ or CH═CH₂ with one or two C₀₋₄ alkyl groups which may optionally be substituted with a substituent selected from the group consisting of carbamoyl group, hydroxyl group, a C₁₋₃ alkoxy group and an amino group;

Y represents (1) a group represented by formula: -CONH-, -CH₂O-, -CH₂S-, -COCH₂-, -CH₂CH₂-, CSNH-, -NHCO- or -CH═CH-, which may optionally be substituted with a substituent selected from the group consisting of a C₁₋₆ alkyl group, hydroxyl group and a halogen atom;

XX9 represents Arg or Arg(Me); and,

XX10 represents Phe or Trp.

[5] The metastin derivative according to [3], or a salt thereof, or a prodrug thereof, wherein:

XX0 represents C₁₋₁₂ alkanoyl;

XX2 represents D-Tyr;

XX3 represents Hyp, Pro(4F) or Glu;

XX4 represents Asn or 2-amino-3-ureidopropionic acid;

XX5 represents Thr;

Z⁴ represents O,

R² represents a linear C₁₋₁₀ alkyl group or a C₁₋₁₀ alkyl group consisting of a cyclic alkyl group and a linear alkyl group;

Q¹ represents a C₁₋₄ alkyl group, which may optionally be substituted with a substituent selected from the group consisting of (1) an optionally substituted C₆₋₁₂ aromatic hydrocarbon group, (2) an optionally substituted 5- to 14-membered aromatic heterocyclic group consisting of 1 to 7 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms, and (5) an optionally substituted non-aromatic cyclic hydrocarbon group having carbon atoms not greater than 7;

A represents (1) a nitrogen atom substituted with hydrogen atom, (2) a carbon atom substituted with hydrogen atom, or (4) S;

A′ represents (1) a carbon atom substituted with hydrogen atom or O;

Q² represents (1) an optionally substituted CH₂ or CH═CH₂ with one or two C₁₋₄ alkyl groups which may optionally be substituted with a substituent selected from the group consisting of carbamoyl group, hydroxyl group, a C₁₋₃ alkoxy group and an amino group;

Y represents (1) a group represented by formula: -CONH-, -CSNH-, -NHCO-, -CH₂O-, -CH₂S-, -COCH₂-, -CH═CH- or -CH₂CH₂-, which may optionally be substituted with a C₁₋₆ alkyl group, hydroxyl group or a halogen atom;

XX9 represents Arg or Arg(Me); and,

XX10 represents Trp.

[5a] A compound below, or a salt or prodrug thereof:

(Compound No. 796) Ac-D-Tyr-Hyp-Asn-Thr-Phe-Gly-Leu-Arg(Me)-Trp-NH₂, (Compound No. 803) Ac-D-Tyr-Hyp-Asn-Thr-Phe-Ala-Leu-Arg(Me)-Trp-NH₂, (Compound No. 804) Ac-D-Tyr-Hyp-Asn-Thr-Phe-Ser-Leu-Arg(Me)-Trp-NH₂, (Compound No. 811) Ac-D-Tyr-Hyp-Asn-Thr-Phe-Aib-Leu-Arg(Me)-Trp-NH₂, (Compound No. 818) Ac-D-Tyr-Hyp-Asn-Thr-Phe-Abu-Leu-Arg(Me)-Trp-NH₂, (Compound No. 822) Ac-D-Tyr-Hyp-Asn-Thr-Cha-Gly-Leu-Arg(Me)-Trp-NH₂, (Compound No. 823) Ac-D-Tyr-Hyp-Asn-Thr-Cha-Ala-Leu-Arg(Me)-Trp-NH₂, (Compound No. 827) Ac-D-Tyr-Hyp-Asn-Thr-Phe-Dap-Leu-Arg(Me)-Trp-NH₂, (Compound No. 828) Ac-D-Tyr-Hyp-Asn-Thr-Phe-Ser(Me)-Leu-Arg(Me)-Trp- NH₂, (Compound No. 834) Ac-D-Tyr-Hyp-Asn-Thr-PheΨ(CH₂O)Gly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 839) Ac-D-Tyr-Hyp-Asn-Thr-Pya(2)-Gly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 847) Ac-D-Tyr-Hyp-Asn-Thr-Phe-Val-Leu-Arg(Me)-Trp-NH₂, (Compound No. 848) Ac-D-Tyr-Hyp-Asn-Thr-Pya(3)-Gly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 849) Ac-D-Tyr-Hyp-Asn-Thr-Pya(4)-Gly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 850) Ac-D-Tyr-Hyp-Asn-Thr-PheΨ(CH₂CH₂)Gly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 851) Ac-D-Tyr-Hyp-Asn-Thr-PheΨ(COCH₂)Gly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 852) Ac-D-Tyr-Glu-Asn-Thr-Phe-Gly-Leu-Arg(Me)-Trp-NH₂, (Compound No. 853) Ac-D-Tyr-Glu-Asn-Thr-Cha-Gly-Leu-Arg(Me)-Trp-NH₂, (Compound No. 854) Ac-D-Tyr-Hyp-Asn-Thr-Phe-GlyΨ(CH₂NH)Leu-Arg(Me)- Trp-NH₂, (Compound No. 855) Ac-D-Tyr-Hyp-Asn-Thr-Ala(cPr)-Gly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 857) Ac-D-Tyr-Hyp-Asn-Thr-PheΨ((S)(CHOH—CH₂)Gly-Leu-Arg (Me)-Trp-NH₂, (Compound No. 858) Ac-D-Tyr-Hyp-Asn-Thr-PheΨ((S)CHOH—(E)CH═)Gly-Leu- Arg(Me)-Trp-NH₂, (Compound No. 859) Ac-D-Tyr-Hyp-Asn-Thr-PheΨ((E)CH═CH)Gly-Leu-Arg (Me)-Trp-NH₂, (Compound No. 866) Ac-D-Tyr-Hyp-Asn-Thr-PheΨ((R)CHOH—(E)CH═)Gly-Leu- Arg(Me)-Trp-NH₂, (Compound No. 867) Ac-D-Tyr-Hyp-Asn-Thr-PheΨ((R)CHOH—CH₂)Gly-Leu-Arg (Me)-Trp-NH₂, (Compound No. 869) Ac-D-Tyr-Hyp-Asn-Thr-αMePhe-Gly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 871) Ac-D-Tyr-Hyp-Asn-Thr-Phe(2Me)-Gly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 873) Ac-D-Tyr-Hyp-Asn-Thr-Phe(3Me)-Gly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 875) Ac-D-Tyr-Hyp-Asn-Thr-Phe(4Me)-Gly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 885) Ac-D-Tyr-Hyp-Alb-Thr-Phe-Gly-Leu-Arg(Me)-Trp-NH₂, (Compound No. 892) Ac-D-Tyr-Hyp-Asn-Thr-Phe-GlyΨ((E)CH═CH)Leu- Arg(Me)-Trp-NH₂, (Compound No. 893) Ac-D-Tyr-Hyp-Asn-Thr-Phe-GlyΨ(CH₂CH₂)Leu-Arg(Me)- Trp-NH₂, (Compound No. 894) Ac-D-Tyr-Hyp-Asn-Thr-Cha-Gly-Ala(cPr)-Arg(Me)-Trp- NH₂, (Compound No. 895) Ac-D-Tyr-Glu-Asn-Thr-Cha-Gly-Ala(cPr)-Arg(Me)-Trp- NH₂, (Compound No. 902) Ac-D-Tyr-Hyp-Asn-Thr-Cha-GlyΨ((E)CH═CH)Leu- Arg(Me)-Trp-NH₂, (Compound No. 903) Ac-D-Tyr-Hyp-Alb-Thr-Cha-GlyΨ((E)CH═CH)Leu- Arg(Me)-Trp-NH₂, (Compound No. 904) Ac-D-Tyr-Glu-Asn-Thr-Cha-GlyΨ((E)CH═CH)Leu- Arg(Me)-Trp-NH₂, (Compound No. 905) Ac-D-Tyr-Glu-Alb-Thr-Cha-GlyΨ((E)CHCH)Leu- Arg(Me)-Trp-NH₂, (Compound No. 906) Ac-D-Tyr-Hyp-Alb-Thr-Phe-GlyΨ((E)CH═CH)Leu- Arg(Me)-Trp-NH₂, (Compound No. 907) Ac-D-Tyr-Glu-Asn-Thr-Phe-GlyΨ((E)CH═CH)Leu- Arg(Me)-TrpNH₂, (Compound No. 908) Ac-D-Tyr-Glu-Alb-Thr-Phe-GlyΨ((E)CH═CH)Leu- Arg(Me)-Trp-NH₂, (Compound No. 909) Ac-D-Tyr-Asp-Asn-Thr-Cha-Gly-Ala(cPr)-Arg(Me)-Trp- NH₂, (Compound No. 910) Ac-D-Tyr-Aad-Asn-Thr-Cha-Gly-Ala(cPr)-Arg(Me)-Trp- NH₂, (Compound No. 911) Ac-D-Tyr-Lys-Asn-Thr-Cha-Gly-Ala(cPr)-Arg(Me)-Trp- NH₂, (Compound No. 912) Ac-D-Tyr-Aib-Asn-Thr-Cha-Gly-Ala(cPr)-Arg(Me)-Trp- NH₂, (Compound No. 913) Ac-D-Tyr-Hyp-Gln-Thr-Cha-GlyΨ((E)CH═CH)Leu- Arg(Me)-Trp-NH₂, (Compound No. 914) Ac-D-Tyr-Hyp-Cit-Thr-Cha-GlyΨ((E)CH═CH)Leu- Arg(Me)-Trp-NH₂, (Compound No. 915) Ac-D-Tyr-Hyp-Glu-Thr-Cha-GlyΨ((E)CH═CH)Leu- Arg(Me)-Trp-NH₂, (Compound No. 916) Ac-D-Tyr-Hyp-Asn-Thr-Phe-Gly-Ala(cPr)-Arg(Me)-Trp- NH₂, (Compound No. 917) Ac-D-Tyr-Hyp-Asn-Thr-Phe-Gly-Ser(Me)-Arg(Me)-Trp- NH₂, (Compound No. 918) Ac-D-Tyr-Hyp-Asn-Thr-Phe-Gly-Nva-Mg(Me)-Trp-NH₂, (Compound No. 919) Ac-D-Tyr-Hyp-Asn-Thr-Nal(2)-Gly-Ala(cPr)-Arg(Me)- Trp-NH₂, (Compound No. 920) Ac-D-Tyr-Hyp-Asn-Thr-Cha-Gly-Ser(Me)-Arg(Me)-Trp- NH₂, (Compound No. 921) Ac-D-Tyr-Hyp-Asn-Thr-Cha-Gly-Nva-Arg(Me)-Trp-NH₂, (Compound No. 923) Ac-D-Tyr-Glu-Asn-Thr-Cha-Gly-Ser(Me)-Arg(Me)-Trp- NH₂, (Compound No. 924) Ac-D-Tyr-Glu-Asn-Thr-Cha-Gly-Nva-Arg(Me)-Trp-NH₂, (Compound No. 925) Ac-D-Tyr-Hyp-Asn-Thr-Phe-GlyΨ((E)CH═CH)Leu-Arg- Trp-NH₂, (Compound No. 926) Ac-D-Tyr-Hyp-Asn-Thr-Cha-GlyΨ((E)CH═CH)Leu-Arg- Trp-NH₂, (Compound No. 927) Ac-D-Tyr-Hyp-Alb-Thr-Cha-GlyΨ((E)CH═CH)Leu-Arg- Trp-NH₂, (Compound No. 929) Ac-D-Tyr-Hyp-Asn-Thr-Phe-GlyΨ(CH₂S)Leu-Arg(Me)- Trp-NH₂, (Compound No. 931) Ac-D-Tyr-Hyp-Asn-Thr-Cha-GlyΨ(CH₂S)Leu-Arg(Me)- Trp-NH₂, (Compound No. 932) Ac-D-Tyr-Hyp-Asn-Thr-Cha-Gly-Nle-Arg(Me)-Trp-NH₂, (Compound No. 933) Ac-D-Tyr-Hyp-Asn-Thr-Cha-Gly-Leu(Me)-Arg(Me)-Trp- NH₂, (Compound No. 934) Ac-D-Tyr-Hyp-Asn-Thr-Cha-Gly-Cha-Arg(Me)-Trp-NH₂, (Compound No. 940) Ac-D-Tyr-Hyp-Asn-Thr-Cha-Gly-Ala(cPr)-Arg-Trp-NH₂, (Compound No. 942) Ac-D-Tyr-Glu-Asn-Thr-Cha-Gly-Ala(cPr)-Arg-Trp-NH₂, (Compound No. 944) Ac-D-Tyr-Hyp-Asn-Thr-PheΨ(CH₂S)Gly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 945) Ac-D-Tyr-Hyp-Asn-Thr-Ala(cBu)-Gly-Ala(cPr)-Arg (Me)-Trp-NH₂, (Compound No. 946) Ac-D-Tyr-Hyp-Asn-Thr-Cha-Gly-Ala(cBu)-Arg(Me)-Trp- NH₂, (Compound No. 947) Ac-D-Tyr-Hyp-Alb-Ala-Cha-Gly-Ala(cPr)-Arg(Me)-Trp- NH₂, (Compound No. 948) Ac-D-Tyr-Hyp-Alb-Ser-Cha-Gly-Ala(cPr)-Arg(Me)-Trp- NH₂, (Compound No. 949) Ac-D-Tyr-Hyp-Alb-Gly-Cha-Gly-Ala(cPr)-Arg(Me)-Trp- NH₂, (Compound No. 951) Ac-D-Tyr-Hyp-Alb-Dap-Cha-Gly-Ala(cPr)-Arg(Me)-Trp- NH₂, (Compound No. 952) Ac-D-Tyr-Hyp-Alb-Thr-Cha-GlyΨ(CH₂CH₂)Leu-Arg-Trp- NH₂, (Compound No. 953) Ac-D-Tyr-Hyp-Alb-Thr-Cha-Gly-Ala(cPr)-Arg(Me)-Trp- NH₂, (Compound No. 956) Ac-D-Tyr-Hyp-Asn-Thr-Cha-GlyΨ(CH₂CH₂)Leu-Arg-Trp- NH₂, (Compound No. 957) Ac-D-Tyr-Hyp-Alb-Thr-Cha-GlyΨ(CH₂CH₂)Leu-Arg(Me)- Trp-NH₂, (Compound No. 959) Ac-D-Tyr-Pro(4F)-Asn-Thr-Cha-Gly-Ala(cPr)-Arg(Me)- Trp-NH₂, or, (Compound No. 968) Ac-D-Tyr-Hyp-Asn-Thr-PheΨ(CH₂CH₂)AzaGly-Leu-Arg (Me)-Trp-NH₂.

[6] A compound selected from:

(Compound No. 894) Ac-D-Tyr-Hyp-Asn-Thr-Cha-Gly-Ala(cPr)-Arg(Me)-Trp- NH₂, (Compound No. 902) Ac-D-Tyr-Hyp-Asn-Thr-Cha-GlyΨ((E)CH═CH)Leu- Arg(Me)-Trp-NH₂, (Compound No. 903) Ac-D-Tyr-Hyp-Alb-Thr-Cha-GlyΨ((E)CH═CH)Leu- Arg(Me)-Trp-NH₂, (Compound No. 926) Ac-D-Tyr-Hyp-Asn-Thr-Cha-GlyΨ((E)CH═CH)Leu-Arg- Trp-NH₂, (Compound No. 927) Ac-D-Tyr-Hyp-Alb-Thr-Cha-GlyΨ((E)CH═CH)Leu-Arg- Trp-NH₂, (Compound No. 953) Ac-D-Tyr-Hyp-Alb-Thr-Cha-Gly-Ala(cPr)-Arg(Me)-Trp- NH₂ and (Compound No. 959) Ac-D-Tyr-Pro(4F)-Asn-Thr-Cha-Gly-Ala(cPr)-Arg(Me)- Trp-NH₂.

[7] The metastin derivative according to [1] or a salt thereof, or a prodrug thereof.

[8] The metastin derivative according to [3] or a salt thereof, or a prodrug thereof.

[9] A medicament comprising the metastin derivative according to [1] through [6] or a salt thereof, or a prodrug thereof.

[10] The medicament according to [9] above, which is an agent for suppressing cancer metastasis or an agent for suppressing cancer growth.

[11] The medicament according to [9] above, which is an agent for preventing/treating cancer.

[12] The medicament according to [9] above, which is an agent for controlling the placental function.

[13] The medicament according to [9] above, which is an agent for preventing/treating choriocarcinoma, hydatidiform mole, invasive mole, miscarriage, fetal hypoplasia, abnormal glucose metabolism, abnormal lipid metabolism or labor induction.

[14] The medicament according to [9] above, which is an agent for improving the gonadal function.

[15] The medicament according to [9] above, which is an agent for preventing/treating hormone-dependent cancer, infertility, endometriosis, early puberty or myoma of the uterus.

[16] The medicament according to [9] above, which is an agent for inducing or stimulating ovulation.

[17] The medicament according to [9] above, which is a gonadotropic hormone secretagogue agent or a sex hormone secretagogue agent.

[18] The medicament according to [9] above, which is an agent for preventing/treating Alzheimer's disease, moderate cognitive impairment or autism.

[19] The medicament according to [17] above, which is an agent for down-regulating gonadotropic hormone or sex hormone.

[20] The medicament according to [17] above, which is an agent for down-regulating human OT7T175 (metastin receptor) protein consisting of the amino acid sequence represented by SEQ ID NO: 9.

[21] The medicament according to [19] or [20] above, which is an agent for preventing/treating hormone-dependent cancer.

The present invention further provides the following features, and so on.

[22] A method for suppressing cancer metastasis or suppressing cancer growth, which comprises administering to a mammal an effective dose of the metastin derivative according to any one of [1] through [6] or a salt thereof, or a prodrug thereof.

[23] A method for preventing/treating cancer, which comprises administering to a mammal an effective dose of the metastin derivative according to any one of [1] through [6] or a salt thereof or a prodrug thereof.

[24] A method for controlling the placental function, which comprises administering to a mammal an effective dose of the metastin derivative according to any one of [1] through [6] or a salt thereof, or a prodrug thereof.

[25] A method of preventing/treating choriocarcinoma, hydatidiform mole, invasive mole, miscarriage, fetal hypoplasia, abnormal glucose metabolism, abnormal lipid metabolism or labor induction, which comprises administering to a mammal an effective dose of the metastin derivative according to any one of [1] through [6] or a salt thereof, or a prodrug thereof.

[26] A method for improving the gonadal function, which comprises administering to a mammal an effective dose of the metastin derivative according to any one of [1] through [6] or a salt thereof, or a prodrug thereof.

[27] A method for preventing/treating hormone-dependent cancer, infertility, endometriosis, early puberty or myoma of the uterus, which comprises administering to a mammal an effective dose of the metastin derivative according to any one of [1] through [6] or a salt thereof, or a prodrug thereof.

[28] A method for inducing or stimulating ovulation, which comprises administering to a mammal an effective dose of the metastin derivative according to any one of [1] through [6] or a salt thereof, or a prodrug thereof.

[29] A method for inducing gonadotropic hormone secretion or inducing sex hormone secretion, which comprises administering to a mammal an effective dose of the metastin derivative according to any one of [1] through [6] or a salt thereof, or a prodrug thereof.

[30] A method for preventing/treating Alzheimer's disease, moderate cognitive impairment or autism, which comprises administering to a mammal an effective dose of the metastin derivative according to any one of [1] through [6] or a salt thereof, or a prodrug thereof.

[31] A method for down-regulation of gonadotropic hormone or sex hormone, which comprises administering to a mammal an effective dose of the metastin derivative according to any one of [1] through [6] or a salt thereof, or a prodrug thereof.

[32] A method for down-regulating human OT7T175 (metastin receptor) protein consisting of the amino acid sequence represented by SEQ ID NO: 9, which comprises administering to a mammal an effective dose of the metastin derivative according to any one of [1] through [6] or a salt thereof, or a prodrug thereof.

[33] A method for preventing/treating hormone-dependent cancer, which comprises administering to a mammal an effective dose of the metastin derivative according to any one of [1] through [6] or a salt thereof, or a prodrug thereof.

[34] Use of the metastin derivative according to any one of [1] through [6] or a salt thereof, or a prodrug thereof, to manufacture an agent for suppressing cancer metastasis or an agent for suppressing cancer growth.

[34a] The metastin derivative according to any one of [1] through [6] or a salt thereof, or a prodrug thereof, for use in suppressing cancer metastasis or suppressing cancer growth.

[35] Use of the metastin derivative according to any one of [1] through [6] or a salt thereof, or a prodrug thereof, to manufacture an agent for preventing/treating cancer.

[35a] The metastin derivative according to any one of [1] through [6] or a salt thereof, or a prodrug thereof, for use in preventing/treating cancer.

[36] Use of the metastin derivative according to any one of [1] through [6] or a salt thereof, or a prodrug thereof, to manufacture an agent for controlling the placental function.

[36a] The metastin derivative according to any one of [1] through [6] or a salt thereof, or a prodrug thereof, for use in controlling the placental function.

[37] Use of the metastin derivative according to any one of [1] through [6] or a salt thereof, or a prodrug thereof, to manufacture an agent for preventing/treating choriocarcinoma, hydatidiform mole, invasive mole, miscarriage, fetal hypoplasia, abnormal glucose metabolism, abnormal lipid metabolism or labor induction.

[37a] The metastin derivative according to any one of [1] through [6] or a salt thereof, or a prodrug thereof, for use in preventing/treating choriocarcinoma, hydatidiform mole, invasive mole, miscarriage, fetal hypoplasia, abnormal glucose metabolism, abnormal lipid metabolism or labor induction.

[38] Use of the metastin derivative according to any one of [1] through [6] or a salt thereof, or a prodrug thereof, to manufacture an agent for improving the gonadal function.

[38a] The metastin derivative according to any one of [1] through [6] or a salt thereof, or a prodrug thereof, for use in improving the gonadal function.

[39] Use of the metastin derivative according to any one of [1] through [6] or a salt thereof, or a prodrug thereof, to manufacture an agent for preventing/treating hormone-dependent cancer, infertility, endometriosis, early puberty or myoma of the uterus.

[39a] The metastin derivative according to any one of [1] through [6] or a salt thereof, or a prodrug thereof, for use in the prevention/treatment of hormone-dependent cancer, infertility, endometriosis, early puberty or myoma of the uterus.

[40] Use of the metastin derivative according to any one of [1] through [6] or a salt thereof, or a prodrug thereof, to manufacture an agent for inducing or stimulating ovulation.

[40a] The metastin derivative according to any one of [1] through [6] or a salt thereof, or a prodrug thereof, for use in inducing or stimulating ovulation.

[41] Use of the metastin derivative according to any one of [1] through [6] or a salt thereof, or a prodrug thereof, to manufacture a gonadotropic hormone secretagogue agent or a sex hormone secretagogue agent.

[41a] The metastin derivative according to any one of [1] through [6] or a salt thereof, or a prodrug thereof, for use in inducing gonadotropic hormone secretion or sex hormone secretion.

[42] Use of the metastin derivative according to any one of [1] through [6] or a salt thereof, or a prodrug thereof, to manufacture an agent for preventing/treating Alzheimer's disease, moderate cognitive impairment or autism.

[42a] The metastin derivative according to any one of [1] through [6] or a salt thereof, or a prodrug thereof, for use in preventing/treating Alzheimer's disease, moderate cognitive impairment or autism.

[43] Use of the metastin derivative according to any one of [1] through [6] or a salt thereof, or a prodrug thereof, to manufacture a down-regulating agent for gonadotropic hormone or sex hormone.

[43a] The metastin derivative according to any one of [1] through [6] or a salt thereof, or a prodrug thereof, for use in the down-regulation of gonadotropic hormone or sex hormone.

[44] Use of the metastin derivative according to any one of [1] through [6] or a salt thereof, or a prodrug thereof, to manufacture an agent for down-regulating human OT7T175 (metastin receptor) protein consisting of the amino acid sequence represented by SEQ ID NO: 9.

[44a] The metastin derivative according to any one of [1] through [6] or a salt thereof, or a prodrug thereof, for use in the down-regulation of human OT7T175 (metastin receptor) protein consisting of the amino acid sequence represented by SEQ ID NO: 9.

[45] Use of the metastin derivative according to any one of [1] through [6] or a salt thereof, or a prodrug thereof, to manufacture an agent for preventing/treating hormone-dependent cancer.

[45a] The metastin derivative according to any one of [1] through [6] or a salt thereof, or a prodrug thereof, for use in the prevention/treatment of hormone-dependent cancer.

The present invention further provides the following features, and so on.

[46] (1) An agent for controlling the pancreatic function, (2) an agent for preventing/treating acute or chronic pancreatitis or pancreatic cancer, (3) a hyperglycemic agent, a pancreatic glucagon secretagogue agent or an agent for promoting urine formation, (4) an agent for preventing/treating, obesity, hyperlipemia, type II diabetes mellitus, hypoglycemia, hypertension, diabetic neuropathy, diabetic nephropathy, diabetic retinopathy, edema, urinary disturbances, insulin resistance, unstable diabetes, fatty atrophy, insulin allergy, insulinoma, arteriosclerosis, thrombotic disorders or lipotoxicity, (5) an agent for suppressing gonadotropic hormone secretion or an agent for suppressing sex hormone secretion, or (6) an agent for inhibiting ovarian follicular maturation, a menstrual cycle-suspending agent or a contraceptive, which comprises the metastin derivative according to any one of [1] through [6] or a salt thereof, or a prodrug thereof.

[47] (1) A method for controlling the pancreatic function, (2) a method for preventing/treating acute or chronic pancreatitis or pancreatic cancer, (3) a hyperglycemic agent, a pancreatic glucagon secretagogue agent or an agent for promoting urine formation, (4) an agent for preventing/treating, obesity, hyperlipemia, type II diabetes mellitus, hypoglycemia, hypertension, diabetic neuropathy, diabetic nephropathy, diabetic retinopathy, edema, urinary disturbances, insulin resistance, unstable diabetes, fatty atrophy, insulin allergy, insulinoma, arteriosclerosis, thrombotic disorders or lipotoxicity, (5) an agent for suppressing gonadotropic hormone secretion or an agent for suppressing sex hormone secretion, or (6) an agent for inhibiting ovarian follicular maturation, a menstrual cycle-suspending agent or a contraceptive, which comprises administering to a mammal an effective dose of the metastin derivative according to any one of [1] through [6] or a salt thereof, or a prodrug thereof.

[48] Use of the metastin derivative according to any one of [1] through [6] or a salt thereof, or a prodrug thereof, to manufacture (1) an agent for controlling the pancreatic function, (2) an agent for preventing/treating acute or chronic pancreatitis or pancreatic cancer, (3) a hyperglycemic agent, a pancreatic glucagon secretagogue agent or an agent for promoting urine formation, (4) an agent for preventing/treating, obesity, hyperlipemia, type II diabetes mellitus, hypoglycemia, hypertension, diabetic neuropathy, diabetic nephropathy, diabetic retinopathy, edema, urinary disturbances, insulin resistance, unstable diabetes, fatty atrophy, insulin allergy, insulinoma, arteriosclerosis, thrombotic disorders or lipotoxicity, (5) an agent for suppressing gonadotropic hormone secretion or an agent for suppressing sex hormone secretion, or

-   (6) an agent for inhibiting ovarian follicular maturation, a     menstrual cycle-suspending agent or a contraceptive.

The metastin derivative of the present invention, its salts, or prodrugs thereof have excellent blood stability, in addition to excellent cancer metastasis inhibiting action or cancer growth suppressing action and are useful as agents for preventing/treating cancers (e.g., lung cancer, gastric cancer, liver cancer, pancreatic cancer, colorectal cancer, rectal cancer, colonic cancer, prostate cancer, ovarian cancer, cervical cancer, breast cancer, etc.). The metastin derivative of the present invention, its salts, or prodrugs thereof have the effects of regulating functions of the pancreas and are useful as medicaments for preventing/treating pancreatic diseases (e.g., acute or chronic pancreatitis, pancreatic cancer, etc.). The metastin derivative of the present invention, its salts, or prodrugs thereof have the effects of regulating functions of the placenta and are useful as medicaments for preventing/treating choriocarcinoma, hydatidiform mole, invasive mole, miscarriage, fetal hypoplasia, abnormal glucose metabolism, abnormal lipid metabolism or labor induction.

Also, the metastin derivative of the present invention or its salts or prodrugs have the effects of increasing sugar level, promoting pancreatic glucagon secretion and promoting urine formation, and are useful as agents for preventing/treating obesity, hyperlipemia, type II diabetes mellitus, hypoglycemia, hypertension, diabetic neuropathy, diabetic nephropathy, diabetic retinopathy, edema, urinary disturbances, insulin resistance, unstable diabetes mellitus, fatty atrophy, insulin allergy, insulinoma, arteriosclerosis, thrombotic disorders or lipotoxicity.

In addition, the metastin derivative of the present invention or its salts or prodrugs have excellent activities of stimulating gonadotropic hormone secretion, stimulating sex hormone secretion, inducing ovulation or stimulating ovulation, and are useful as low toxic and stable agents, e.g., agents for improving gonadal function, agents for preventing/treating hormone-dependent cancer (e.g., prostate cancer, breast cancer, etc.), infertility, endometriosis, early puberty, myoma of the uterus, etc., agents for inducing or stimulating ovulation, gonadotropic hormone secretagogue agents, contraceptives, sex hormone secretagogue agents, or the like.

Furthermore, the metastin derivative of the present invention or its salts or prodrugs are useful as agents for preventing/treating Alzheimer's disease, moderate cognitive impairment, autism, etc.

The metastin derivative of the present invention or its salts or prodrugs are useful as agents for suppressing gonadotropic hormone secretion or suppressing sex hormone secretion; agents for down-regulating gonadotropic hormone or sex hormone; agents for down-regulating human OT7T175 (metastin receptor) protein consisting of the amino acid sequence represented by SEQ ID NO: 9; agents for preventing/treating hormone-dependent cancers (e.g., prostate cancer, breast cancer, etc.; particularly, hormone-sensitive prostate cancer, hormone-sensitive breast cancer, etc.); agents for preventing/treating endometriosis; agents for inhibiting ovarian follicular maturation; menstrual cycle-suspending agents; agents for treating myoma of the uterus; agents for treating early puberty; contraceptives, etc.

In addition, the metastin derivative of the present invention or its salts or prodrugs are useful as agents for potentiating immunity (e.g., prophylactic agents for infection after bone-marrow transplant, agents for potentiating immunity intended for cancer, etc); immunostimulators (e.g., regeneration of the thymus, regrowth of the thymus, enhancement of T cell development, etc); agents for preventing/treating bulbospinal muscular atrophy; agents for protecting ovary; agents for preventing/treating benign prostate hypertrophy (BPH); agents for preventing/treating gender identity disorder; or agents for in vitro fertilization (IVF). In addition, they are also useful as agents for preventing/treating infertility, hypogonadism, oligospermia, azoospermia, aspermia, asthenospermia, or necrospermia. Further, they are useful for hormone-dependent diseases (e.g., sex hormone dependent cancer such as prostate cancer, uterine cancer, breast cancer, hypophyseal tumor, etc.), prostate gland enlargement, endometriosis, uterine fibroid, early puberty, dysmenorrhea, amenorrhea, menstrual syndrome, multilocular ovary syndrome, postoperative relapse of the above-mentioned cancers, metastasis of the above-mentioned cancers, hypopituitarism, dwarfism (the case where the secretion of growth hormone was compromised with hyposecretion of pituitary hormone, etc.), menopausal disorder, indefinite complaint, sex hormone dependent disorders such as calcium phosphor bone metabolic disorders. It is also applicable for contraception (or infertility when rebound effects after cessation of the drug are utilized), etc.

Moreover, metastin per se or DNA encoding metastin, etc. are also useful as agents for suppressing gonadotropic hormone secretion or sex hormone secretion; down-regulating agents for gonadotropic hormone or suppressing sex hormone; down-regulating agents for human OT7T175 (metastin receptor) protein consisting of the amino acid sequence represented by SEQ ID NO: 9; agents for preventing/treating hormone-dependent cancers (e.g., prostate cancer, breast cancer, etc.; particularly, hormone-sensitive prostate cancer, hormone-sensitive breast cancer, etc.); agents for preventing/treating endometriosis; agents for inhibiting ovarian follicular maturation; menstrual cycle-suspending agents; agents for treating myoma of the uterus; agents for treating early puberty; contraceptives, etc.

In the formulas described above, n represents 0 or 1; W¹ represents N, CH or O (provided that when W¹ is N or CH, n represents 1 and when W¹ is O, n represents 0); W² represents N or CH; each of Z¹, Z⁵ and Z⁷ represents hydrogen atom or a C₁₋₃ alkyl group; and each of Z², Z⁴, Z⁶ and Z⁸ represents hydrogen atom, O or S.

Herein, when Z², Z⁴, Z⁶ or Z⁸ represents hydrogen atom, the moiety shown by >C═Z², >C═2 Z⁴, >C═Z⁶ or >C═Z⁸ each indicates the structure of >CH₂.

The C₁₋₃ alkyl group used includes methyl group, ethyl group, propyl group and isopropyl group.

W¹ is preferably N and W² is preferably CH.

Z¹ is preferably hydrogen atom.

Z² is preferably O.

Z⁴ is preferably O.

Z⁵ is preferably hydrogen atom.

Z⁶ is preferably O.

Z⁷ is preferably hydrogen atom.

Z⁸ is preferably O.

Preferred combinations of Z¹, Z², Z⁴, Z⁵, Z⁶, Z⁷ and Z⁸ further include the cases where Z¹ is hydrogen atom and each of Z⁵ and Z⁷ represents hydrogen atom or a C₁₋₃ alkyl group and each of Z², Z⁴, Z⁶ and Z⁸ represents O or S.

More preferably, the combinations of Z¹ to Z⁸ include:

(a) the case where Z¹ is hydrogen atom, Z⁵ is hydrogen atom, Z⁷ is hydrogen atom, Z² is O, Z⁴ is O, Z⁶ is O and Z⁸ is O;

(b) the case where Z¹ is hydrogen atom, Z⁵ is hydrogen atom, Z⁷ is hydrogen atom, Z² is O, Z⁴ is O, Z⁶ is O and Z⁸ is S;

(c) the case where Z¹ is hydrogen atom, Z⁵ is hydrogen atom, Z⁷ is methyl group, Z² is O, Z⁴ is O, Z⁶ is O and Z⁸ is O; etc. Inter alia, (a) and (b) are preferred, more preferably (a).

R¹ represents (1) hydrogen atom, (2) a C₁₋₈ alkyl group optionally substituted with a substituent selected from the group consisting of an optionally substituted carbamoyl group, an optionally substituted hydroxyl group and an optionally substituted aromatic cyclic group, (3) a cyclic or linear C₁₋₁₀ alkyl group, (4) a C₁₋₁₀ alkyl group consisting of a cyclic alkyl group and a linear alkyl group or (5) an optionally substituted aromatic cyclic group; inter alia, (1) hydrogen atom, or (2) a C₁₋₈ alkyl group optionally substituted with a substituent selected from the group consisting of an optionally substituted carbamoyl group, an optionally substituted hydroxyl group and an optionally substituted aromatic cyclic group; preferably (1) hydrogen atom, or (2) a C₁₋₈ alkyl group substituted with a substituent selected from the group consisting of an optionally substituted carbamoyl group, an optionally substituted hydroxyl group and an optionally substituted aromatic cyclic group; and more preferably (2) a C₁₋₈ alkyl group substituted with an optionally substituted hydroxyl group.

The “C₁₋₈ alkyl group” used includes, for example, a linear C₁₋₈ alkyl group such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl, pentyl, isopentyl, neopentyl, hexyl, heptyl, octyl, etc., a cyclic C₃₋₈ alkyl group such as cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, etc. Inter alia, a C₁₋₃ alkyl group such as methyl, ethyl, etc. are particularly preferred.

The “optionally substituted carbamoyl group” used includes, for example, carbamoyl, a mono-C₁₋₆ alkylcarbamoyl group (e.g., methylcarbamoyl, ethylcarbamoyl, etc.), a di-C₁₋₆ alkylcarbamoyl group (e.g., dimethylcarbamoyl, diethylcarbamoyl, ethylmethylcarbamoyl, etc.), a mono- or di-C₆₋₁₄ arylcarbamoyl group (e.g., phenylcarbamoyl, 1-naphthylcarbamoyl, 2-naphthylcarbamoyl, etc.), a mono- or di-5- or 7-membered heterocyclic carbamoyl group containing 1 to 4 hetero atoms of 1 or 2 species selected from nitrogen, sulfur and oxygen atoms in addition to carbon atoms (e.g., 2-pyridylcarbamoyl, 3-pyridylcarbamoyl, 4-pyridylcarbamoyl, 2-thienylcarbamoyl, 3-thienylcarbamoyl, etc.), and the like.

The “optionally substituted hydroxyl group” used includes, for example, hydroxy group, an optionally substituted C₁₋₆ alkoxy group, an optionally substituted C₆₋₁₄ aryloxy group, an optionally substituted C₇₋₁₆ aralkyloxy group, etc. The “optionally substituted C₁₋₆ alkoxy group,” “optionally substituted C₆₋₁₄ aryloxy group” and “optionally substituted C₇₋₁₆ aralkyloxy group” used are those given for the “optionally substituted C₁₋₆ alkoxy group,” “optionally substituted C₆₋₁₄ aryloxy group” and “optionally substituted C₇₋₁₆ aralkyloxy group” in Substituent Group A, which will be later described.

The “aromatic cyclic group” in “optionally substituted aromatic cyclic group” used includes, for example, an aromatic hydrocarbon group, aromatic heterocyclic group, an aromatic fused-ring group, an aromatic fused heterocyclic group, etc.

The “aromatic hydrocarbon group” used includes, for example, a C₆₋₁₄ aryl group such as phenyl, 2-biphenylyl, 3-biphenylyl, 4-biphenylyl, cyclooctatetraenyl, etc.

The “aromatic heterocyclic group” used includes, for example, a 5- to 14-membered, preferably 5- to 10-membered, more preferably 5- or 6-membered aromatic heterocyclic group containing 1 to 4 hetero atoms of 1 or 2 species selected from nitrogen, sulfur and oxygen atoms in addition to carbon atoms. Specific examples are thienyl (e.g., 2-thienyl, 3-thienyl), furyl (e.g., 2-furyl, 3-furyl), pyridyl (e.g., 2-pyridyl, 3-pyridyl, 4-pyridyl), thiazolyl (e.g., 2-thiazolyl, 4-thiazolyl, 5-thiazolyl), oxazolyl (e.g., 2-oxazolyl, 4-oxazolyl), pyrazinyl, pyrimidinyl (e.g., 2-pyrimidinyl, 4-pyrimidinyl), pyrrolyl (e.g., 1-pyrrolyl, 2-pyrrolyl, 3-pyrrolyl), imidazolyl (e.g., 1-imidazolyl, 2-imidazolyl, 4-imidazolyl), pyrazolyl (e.g., 1-pyrazolyl, 3-pyrazolyl, 4-pyrazolyl), pyridazinyl (e.g., 3-pyridazinyl, 4-pyridazinyl), isothiazolyl (e.g., 3-isothiazolyl), isoxazolyl (e.g., 3-isoxazolyl), etc.

The “aromatic fused-ring group” used includes a C₈₋₁₄ aromatic fused-ring group such as naphthyl (e.g., 1-naphthyl, 2-naphthyl), anthryl (e.g., 2-anthryl, 9-anthryl) and the like.

The “aromatic fused heterocyclic group” used includes, for example, a 5- to 14-membered (preferably 5- to 10-membered) bicyclic or tricyclic aromatic heterocyclic group containing 1 to 4 hetero atoms of 1 or 2 species selected from nitrogen, sulfur and oxygen atoms in addition to 3 to 11 carbon atoms, or a monovalent group formed by removing one optional hydrogen atom from a 7- to 10-membered aromatic bridged-hetero ring in 5- to 14-membered (preferably 5- to 10-membered) ring containing 1 to 4 hetero atoms of 1 or 2 species selected from nitrogen, sulfur and oxygen atoms in addition to carbon atoms. Specific examples of these groups used are quinolyl (e.g., 2-quinolyl, 3-quinolyl, 4-quinolyl, 5-quinolyl, 8-quinolyl), isoquinolyl (e.g., 1-isoquinolyl, 3-isoquinolyl, 4-isoquinolyl, 5-isoquinolyl), indolyl (e.g., 1-indolyl, 2-indolyl, 3-indolyl), 2-benzothiazolyl, benzo[b]thienyl, (e.g., 2-benzo[b]thienyl, 3-benzo[b]thienyl), benzo[b]furanyl (e.g., 2-benzo[b]furanyl, 3-benzo[b]furanyl) and the like.

The “substituent” used in the “aromatic cyclic group” includes a substituent selected from Substituent Group A, which will be later described.

As R¹, there are used hydrogen atom, carbamoylmethyl, 2-carbamoylethyl, hydroxymethyl, 1-hydroxyethyl, benzyl, 4-hydroxybenzyl, 2-pyridylmethyl, 3-pyridylmethyl, 4-pyridylmethyl, 2-thienylmethyl, 3-thienylmethyl, 1-naphthylmethyl, 2-naphthylmethyl, 3-indolemethyl, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl, cyclohexylmethyl, phenyl, acetoxymethyl, methoxymethyl, etc.; among others, preferred are hydroxymethyl, 1-hydroxyethyl, benzyl, 4-hydroxybenzyl, 3-indolemethyl, methyl, isobutyl, etc., more preferably, hydroxymethyl, 1-hydroxyethyl, etc., and most preferably 1-hydroxyethyl.

R² represents (1) hydrogen atom, (2) a cyclic or linear C₁₋₁₀ alkyl group, (3) a C₁₋₁₀ alkyl group consisting of a cyclic alkyl group and a linear alkyl group, or (4) a C₁₋₈ alkyl group optionally substituted with a substituent selected from the group consisting of an optionally substituted carbamoyl group, an optionally substituted hydroxyl group and an optionally substituted aromatic cyclic group. Among others, preferred are (1) hydrogen atom, (2) a cyclic or linear C₁₋₁₀ alkyl group, or (3) a C₁₋₁₀ alkyl group consisting of a cyclic alkyl group and a linear alkyl group. In particular, a linear C₁₋₁₀ alkyl group or a C₁₋₁₀ alkyl group consisting of a cyclic alkyl group and a linear alkyl group is preferred.

The cyclic C₁₋₁₀ alkyl group used includes, for example, a C₃₋₈ cycloalkyl group such as cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, etc.

Examples of the linear C₁₋₁₀ alkyl group include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl, pentyl, isopentyl, neopentyl, hexyl, heptyl, octyl, nonanyl, decanyl, etc.

The C₁₋₁₀ alkyl group consisting of a cyclic alkyl group and a linear alkyl group used includes, for example, a C₃₋₇ cycloalkyl-C₁₋₃ alkyl group such as cyclopentylmethyl, cyclohexylmethyl, etc.

Examples of R² include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl, cyclopropylmethyl, cyclobutylmethyl, cyclohexylmethyl, benzyl, hydroxymethyl, 2-carbamoylethyl, tert-pentyl, etc.; among others, preferred are methyl, ethyl, propyl, isopropyl, isobutyl, sec-butyl, tert-butyl, etc., more preferably, propyl, isopropyl, isobutyl, cyclopropylmethyl, etc.

R³ represents:

-   (1) a C₁₋₈ alkyl group having an optionally substituted basic group     and optionally having an additional substituent, -   (2) an aralkyl group having an optionally substituted basic group     and optionally having an additional substituent, -   (3) a C₁₋₄ alkyl group having a non-aromatic cyclic hydrocarbon     group of carbon atoms not greater than 7 having an optionally     substituted basic group, and optionally having an additional     substituent, or, -   (4) a C₁₋₄ alkyl group having a non-aromatic heterocyclic group of     carbon atoms not greater than 7 having an optionally substituted     basic group, and optionally having an additional substituent;     particularly preferably (1) a C₁₋₈ alkyl group having an optionally     substituted basic group and optionally having an additional     substituent.

The “optionally substituted basic group” used includes, for example, (1) a guanidino group optionally having 1 or 2 substituents from C₁₋₆ alkyl, C₁₋₆ acyl (e.g., methyl, ethyl, propyl, isopropyl, butyl, acetyl, propionyl, etc.), etc., (2) an amino group optionally having 1 to 3 substituents from C₁₋₆ alkyl, C₁₋₆ acyl (e.g., methyl, ethyl, propyl, isopropyl, butyl, acetyl, propionyl, etc.), etc., (3) a C₁₋₆ alkylcarbonylamino group (e.g., acetamido) optionally substituted with a guanidino group optionally having 1 or 2 substituents from C₁₋₆ alkyl, C₁₋₆ acyl (e.g., methyl, ethyl, propyl, isopropyl, butyl, acetyl, propionyl, etc.), etc., (4) a C₁₋₆ alkylcarbonylamino group (e.g., acetamido) optionally substituted with an amino group optionally having 1 to 3 substituents from C₁₋₆ alkyl, C₁₋₆ acyl (e.g., methyl, ethyl, propyl, isopropyl, butyl, acetyl, propionyl, etc.), etc. Among others, preferred are guanidino, N-methylguanidino, N,N-dimethylguanidino, N,N′-dimethylguanidino, N-ethylguanidino, N-acetylguanidino, amino, N-methylamino, N,N-dimethylamino, aminoacetamido, guanidinoacetamido, amidino, and the like.

The “additional substituent” other than the “optionally substituted basic group” used includes a substituent selected from Substituent Group A later described.

Examples of the “C₁₋₈ alkyl group” used are methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl, pentyl, isopentyl, neopentyl, hexyl, heptyl, octyl, etc.

The “aralkyl group” used includes, for example, a C₇₋₁₆ aralkyl group such as benzyl, phenethyl, diphenylmethyl, 1-naphthylmethyl, 2-naphthylmethyl, 2,2-diphenylethyl, 3-phenylpropyl, 4-phenylbutyl, 5-phenylpentyl, 2-biphenylylmethyl, 3-biphenylylmethyl, 4-biphenylylmethyl, etc.

The “non-aromatic cyclic hydrocarbon group of carbon atoms not greater than 7” used includes, for example, a C₃₋₇ cycloalkyl group such as cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, etc.

The “non-aromatic heterocyclic group of carbon atoms not greater than 7” used includes, for example, a 5- to 10-membered non-aromatic heterocyclic group containing 1 to 4 hetero atoms of 1 or 2 species selected from nitrogen, sulfur and oxygen atoms, in addition to 1 to 7 carbon atoms, etc. Specific examples used are pyrrolidinyl (e.g., 1-pyrrolidinyl, 2-pyrrolidinyl, 3-pyrrolidinyl), oxazolidinyl (e.g., 2-oxazolidinyl), imidazolinyl (e.g., 1-imidazolinyl, 2-imidazolinyl, 4-imidazolinyl), piperidinyl (e.g., 1-piperidinyl, 2-piperidinyl, 3-piperidinyl, 4-piperidinyl), piperazinyl (e.g., 1-piperazinyl, 2-piperazinyl), morpholino, thiomorpholino, etc.

Examples of the “C₁₋₄ alkyl group” used include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl, etc.

For R³, there are used, for example, (1) 3-guanidinopropyl, 3-(N-methylguanidino)propyl, 3-(N,N-dimethylguanidino)propyl, 3-(N,N′-dimethylguanidino)propyl, 3-(N-ethylguanidino)propyl, 3-(N-propylguanidino)propyl, 3-(N-acetylguanidino)propyl, 4-guanidinobutyl, 4-(N-methylguanidino)butyl, 2-guanidinoethyl, 2-(N-methylguanidino)ethyl, 4-aminobutyl, 4-(N-methylamino)butyl, 4-(N,N-dimethylamino)butyl, 3-aminopropyl, 2-aminoethyl, aminomethyl, aminoacetamidomethyl, guanidinoacetamidomethyl, 2-(guanidinocarbonyl)ethyl, (2)4-guanidinobenzyl, 4-aminobenzyl, (3) 4-guanidinocyclohexylmethyl, 4-aminocyclohexylmethyl, (4) 1-amidinopiperidin-4-ylmethyl, 4-pyridylmethyl, etc.; among others, preferred are 3-guanidinopropyl, 3-(N-methylguanidino)propyl, 3-(N,N-dimethylguanidino)propyl, 3-(N,N′-dimethylguanidino)propyl, 3-(N-ethylguanidino)propyl, 3-(N-propylguanidino)propyl, 3-(N-acetylguanidino)propyl, 4-guanidinobutyl, 4-(N-methylguanidino)butyl, 2-guanidinoethyl, 2-(N-methylguanidino)ethyl, 4-aminobutyl, 4-(N-methylamino)butyl, 4-(N,N-dimethylamino)butyl, 3-aminopropyl, 2-aminoethyl, 4-aminobenzyl, aminoacetamidomethyl, guanidinoacetamidomethyl, etc., particularly preferably, 3-guanidinopropyl, 3-(N-methylguanidino)propyl, 3-(N, N-dimethylguanidino)propyl, 3-(N,N′-dimethylguanidino)propyl, 3-(N-ethylguanidino)propyl, 3-(N-acetylguanidino)propyl, 4-guanidinobutyl, 4-(N-methylguanidino)butyl, 2-guanidinoethyl, 4-aminobutyl, etc., and most preferably, 3-guanidinopropyl and 3-(N-methylguanidino)propyl.

R⁴ represents a C₁₋₄ alkyl group, which may optionally be substituted with a substituent selected from the group consisting of:

-   (1) an optionally substituted C₆₋₁₂ aromatic hydrocarbon group, -   (2) an optionally substituted 5- to 14-membered aromatic     heterocyclic group consisting of 1 to 7 carbon atoms and hetero     atoms selected from the group consisting of nitrogen, oxygen and     sulfur atoms, -   (3) an optionally substituted C₈₋₁₄ aromatic fused-ring group, -   (4) an optionally substituted 5- to 14-membered aromatic fused     heterocyclic group consisting of 3 to 11 carbon atoms and hetero     atoms selected from the group consisting of nitrogen, oxygen and     sulfur atoms, -   (5) an optionally substituted non-aromatic cyclic hydrocarbon group     having carbon atoms not greater than 7, and, -   (6) an optionally substituted non-aromatic heterocyclic group having     carbon atoms not greater than 7; and preferably, a C₁₋₄ alkyl group     substituted with a substituent selected from the group consisting     of: -   (1) an optionally substituted C₆₋₁₂ aromatic hydrocarbon group, -   (2) an optionally substituted 5- to 14-membered aromatic     heterocyclic group consisting of 1 to 7 carbon atoms and hetero     atoms selected from the group consisting of nitrogen, oxygen and     sulfur atoms, -   (3) an optionally substituted C₈₋₁₄ aromatic fused-ring group, -   (4) an optionally substituted 5- to 14-membered aromatic fused     heterocyclic group consisting of 3 to 11 carbon atoms and hetero     atoms selected from the group consisting of nitrogen, oxygen and     sulfur atoms, -   (5) an optionally substituted non-aromatic cyclic hydrocarbon group     having carbon atoms not greater than 7, and, -   (6) an optionally substituted non-aromatic heterocyclic group having     carbon atoms not greater than 7; particularly preferred is (4) a     C₁₋₄ alkyl group, which may optionally be substituted with an     optionally substituted 5- to 14-membered aromatic fused heterocyclic     group consisting of 3 to 11 carbon atoms and hetero atoms selected     from the group consisting of nitrogen, oxygen and sulfur atoms.

Examples of the “C₁₋₄ alkyl group” used include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl, etc.

The “C₆₋₁₂ aromatic hydrocarbon group” used includes, for example, a monocyclic C₆₋₁₂ aromatic hydrocarbon group such as phenyl, cyclooctatetraenyl, etc.

The “5- to 14-membered aromatic heterocyclic group consisting of 1 to 7 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms” used includes, for example, a 5- to 14-membered, preferably 5- to 10-membered, more preferably 5- or 6-membered monocyclic aromatic heterocyclic group containing 1 to 4 hetero atoms of 1 or 2 species selected from nitrogen, sulfur and oxygen atoms in addition to 1 to 7 carbon atoms. Specific examples used include thienyl (e.g., 2-thienyl, 3-thienyl), furyl (e.g., 2-furyl, 3-furyl), pyridyl (e.g., 2-pyridyl, 3-pyridyl, 4-pyridyl), thiazolyl (e.g., 2-thiazolyl, 4-thiazolyl, 5-thiazolyl), oxazolyl (e.g., 2-oxazolyl, 4-oxazolyl), pyrazinyl, pyrimidinyl (e.g., 2-pyrimidinyl, 4-pyrimidinyl), pyrrolyl (e.g., 1-pyrrolyl, 2-pyrrolyl, 3-pyrrolyl), imidazolyl (e.g., 1-imidazolyl, 2-imidazolyl, 4-imidazolyl), pyrazolyl (e.g., 1-pyrazolyl, 3-pyrazolyl, 4-pyrazolyl), pyridazinyl (e.g., 3-pyridazinyl, 4-pyridazinyl), isothiazolyl (e.g., 3-isothiazolyl), isoxazolyl (e.g., 3-isoxazolyl), etc.

The “C₈₋₁₄ aromatic fused-ring group” used includes, for example, naphthyl (e.g., 1-naphthyl, 2-naphthyl), anthryl (e.g., 2-anthryl, 9-anthryl), etc.

The “5- to 14-membered aromatic fused heterocyclic group consisting of 3 to 11 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms” used includes, for example, a 5- to 14-membered (preferably 5- to 10-membered) bicyclic or tricyclic aromatic heterocyclic group containing 1 to 4 hetero atoms of 1 or 2 species selected from nitrogen, sulfur and oxygen atoms in addition to 3 to 11 carbon atoms, or a monovalent group formed by removing one optional hydrogen atom from a 7- to 10-membered aromatic bridged-hetero ring in 5- to 14-membered (preferably 5- to 10-membered) ring containing 1 to 4 hetero atoms of 1 or 2 species selected from nitrogen, sulfur and oxygen atoms, in addition to carbon atoms. Specific examples used are quinolyl (e.g., 2-quinolyl, 3-quinolyl, 4-quinolyl, 5-quinolyl, 8-quinolyl), isoquinolyl (e.g., 1-isoquinolyl, 3-isoquinolyl, 4-isoquinolyl, 5-isoquinolyl), indolyl (e.g., 1-indolyl, 2-indolyl, 3-indolyl), 2-benzothiazolyl, benzo[b]thienyl, (e.g., 2-benzo[b]thienyl, 3-benzo[b]thienyl), benzo[b]furanyl (e.g., 2-benzo[b]furanyl, 3-benzo[b]furanyl), etc.

The “non-aromatic cyclic hydrocarbon group of carbon atoms not greater than 7” used includes, for example, a C₃₋₇ cycloalkyl group such as cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, etc.

The “non-aromatic heterocyclic group of carbon atoms not greater than 7” used includes, for example, a 5- or 10-membered non-aromatic heterocyclic group containing 1 to 4 hetero atoms of 1 or 2 species selected from nitrogen, sulfur and oxygen atoms, in addition to 1 to 7 carbon atoms, such as pyrrolidinyl (e.g., 1-pyrrolidinyl, 2-pyrrolidinyl, 3-pyrrolidinyl), oxazolidinyl (e.g., 2-oxazolidinyl), imidazolinyl (e.g., 1-imidazolinyl, 2-imidazolinyl, 4-imidazolinyl), piperidinyl (e.g., 1-piperidinyl, 2-piperidinyl, 3-piperidinyl, 4-piperidinyl), piperazinyl (e.g., 1-piperazinyl, 2-piperazinyl), morpholino, thiomorpholino, etc.

The substituents used for these “C₆₋₁₂ aromatic hydrocarbon group,” “5- to 14-membered aromatic heterocyclic group consisting of 1 to 7 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms,” “C₈₋₁₄ aromatic fused-ring group,” “5- to 14-membered aromatic fused heterocyclic group consisting of 3 to 11 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms,” “non-aromatic cyclic hydrocarbon group of carbon atoms not greater than 7” and “non-aromatic heterocyclic group of carbon atoms not greater than 7” include, for example, substituents selected from oxo, a halogen atom (e.g., fluorine, chlorine, bromine, iodine, etc.), C₁₋₃ alkylenedioxy (e.g., methylenedioxy, ethylenedioxy, etc.), nitro, cyano, optionally substituted C₁₋₆ alkyl, optionally substituted C₂₋₆ alkenyl, optionally substituted C₂₋₆ alkynyl, optionally substituted C₃₋₈ cycloalkyl, optionally substituted C₆₋₁₄ aryl, optionally substituted C₇₋₁₆ aralkyl, optionally substituted C₁₋₆ alkoxy, hydroxy, optionally substituted C₆₋₁₄ aryloxy, optionally substituted C₇₋₁₆ aralkyloxy, mercapto, optionally substituted C₁₋₆ alkylthio, optionally substituted C₆₋₁₄ arylthio, optionally substituted C₇₋₁₆ aralkylthio, optionally substituted amino [amino, optionally substituted mono- or di-C₁₋₆ alkylamino (e.g., methylamino, dimethylamino, ethylamino, diethylamino, propylamino, isopropylamino, etc.), optionally substituted mono- or di-C₂₋₆ alkenylamino (e.g., vinylamino, propenylamino, isopropenylamino), optionally substituted C₂₋₆ alkynylamino (e.g., 2-butyn-1-yl-amino, 4-pentyn-1-yl-amino, 5-hexyn-1-yl-amino), optionally substituted mono- or di-C₃₋₈ cycloalkylamino (e.g., cyclopropylamino, cyclohexylamino), optionally substituted C₆₋₁₄ aryl-amino (e.g., phenylamino, diphenylamino, naphthylamino), optionally substituted C₁₋₆ alkoxy-amino (e.g., methoxyamino, ethoxyamino, propoxyamino, isopropoxyamino), formylamino, optionally substituted C₁₋₆ alkylcarbonylamino (e.g., acetylamino, propionylamino, pivaloylamino, etc.), optionally substituted C₃₋₈ cycloalkylcarbonylamino (e.g., cyclopropylcarbonylamino, cyclopentylcarbonylamino, cyclohexylcarbonylamino, etc.), optionally substituted C₆₋₁₄ aryl-carbonylamino (e.g., benzoylamino, naphthoylamino, etc.), optionally substituted C₁₋₆ alkoxy-carbonylamino (e.g., methoxycarbonylamino, ethoxycarbonylamino, propoxycarbonylamino, butoxycarbonylamino, etc.), optionally substituted C₁₋₆ alkylsulfonylamino (e.g., methylsulfonylamino, ethylsulfonylamino, etc.), optionally substituted C₆₋₁₄ arylsulfonylamino (e.g., phenylsulfonylamino, 2-naphthylsulfonylamino, 1-naphthylsulfonylamino, etc.)], formyl, carboxy, optionally substituted C₁₋₆ alkylcarbonyl (e.g., acetyl, propionyl, pivaloyl, etc.), optionally substituted C₃₋₈ cycloalkylcarbonyl (e.g., cyclopropylcarbonyl, cyclopentylcarbonyl, cyclohexylcarbonyl, 1-methyl-cyclohexyl-carbonyl, etc.), optionally substituted C₆₋₁₄ aryl-carbonyl (e.g., benzoyl, 1-naphthoyl, 2-naphthoyl, etc.), optionally substituted C₇₋₁₆ aralkyl-carbonyl (e.g., phenylacetyl, 3-phenylpropionyl, etc.), optionally substituted 5- to 7-membered heterocyclic carbonyl containing 1 to 4 hetero atoms of 1 or 2 species selected from nitrogen, sulfur and oxygen atoms in addition to carbon atoms (e.g., nicotinoyl, isonicotinoyl, thenoyl, furoyl, morpholinocarbonyl, thiomorpholinocarbonyl, piperazin-1-ylcarbonyl, pyrrolidin-1-ylcarbonyl, etc.), optionally esterified carboxyl, optionally substituted carbamoyl, optionally substituted C₁₋₆ alkylsulfonyl (e.g., methylsulfonyl, ethylsulfonyl, etc.), optionally substituted C₁₋₆ alkylsulfinyl (e.g., methylsulfinyl, ethylsulfinyl, etc.), optionally substituted C₆₋₁₄ arylsulfonyl (e.g., phenylsulfonyl, 1-naphthylsulfonyl, 2-naphthylsulfonyl, etc.), optionally substituted C₆₋₁₄ arylsulfinyl (e.g., phenylsulfinyl, 1-naphthylsulfinyl, 2-naphthylsulfinyl, etc.), optionally substituted C₁₋₆ alkylcarbonyloxy (e.g., acetoxy, propionyloxy, etc.), optionally substituted C₆₋₁₄ aryl-carbonyloxy (e.g., benzoyloxy, naphthylcarbonyloxy, etc.), optionally substituted C₁₋₆ alkoxy-carbonyloxy (e.g., methoxycarbonyloxy, ethoxycarbonyloxy, propoxycarbonyloxy, butoxycarbonyloxy, etc.), optionally substituted mono-C₁₋₆ alkylcarbamoyloxy (e.g., methylcarbamoyloxy, ethylcarbamoyloxy, etc.), optionally substituted di-C₁₋₆ alkylcarbamoyloxy (e.g., dimethylcarbamoyloxy, diethylcarbamoyloxy, etc.), optionally substituted mono- or di-C₆₋₁₄ arylcarbamoyloxy (e.g., phenylcarbamoyloxy, naphthylcarbamoyloxy, etc.), optionally substituted heterocyclic group, sulfo, sulfamoyl, sulfinamoyl, sulfenamoyl, or a group of 2 or more (e.g., 2 or 3) of these substituents combined, and the like (Substituent Group A). The number of the substituents is not particularly limited but these rings may have 1 to 5, preferably 1 to 3 substituents in substitutable positions, and when there are two or more substituents, each substituent may be the same or different.

The “optionally esterified carboxyl group” in Substituent Group A includes, for example, an optionally substituted C₁₋₆ alkoxy-carbonyl (e.g., methoxycarbonyl, ethoxycarbonyl, propoxycarbonyl, tert-butoxycarbonyl, etc.), an optionally substituted C₆₋₁₄ aryloxy-carbonyl (e.g., phenoxycarbonyl, etc.), an optionally substituted C₇₋₁₆ aralkyloxy-carbonyl (e.g., benzyloxycarbonyl, phenethyloxycarbonyl, etc.), and the like.

The “C₁₋₆ alkyl” in the “optionally substituted C₁₋₆ alkyl” in Substituent Group A includes, for example, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl, pentyl, isopentyl, neopentyl, hexyl, etc.

The “C₂₋₆ alkenyl” in the “optionally substituted C₂₋₆ alkenyl” in Substituent Group A includes, for example, vinyl, propenyl, isopropenyl, 2-buten-1-yl, 4-penten-1-yl, 5-hexen-1-yl, etc.

The “C₂₋₆ alkynyl” in the “optionally substituted C₂₋₆ alkynyl” in Substituent Group A includes, for example, 2-butyn-1-yl, 4-pentyn-1-yl, 5-hexyn-1-yl, etc.

The “C₃₋₈ cycloalkyl” in the “optionally substituted C₃₋₈ cycloalkyl” in Substituent Group A includes, for example, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, etc.

The “C₆₋₁₄ aryl” in the “optionally substituted C₆₋₁₄ aryl” in Substituent Group A includes, for example, phenyl, 1-naphthyl, 2-naphthyl, 2-biphenylyl, 3-biphenylyl, 4-biphenylyl, 2-anthryl, etc.

The “C₇₋₁₆ aralkyl” in the “optionally substituted C₇₋₁₆ aralkyl” in Substituent Group A includes, for example, benzyl, phenethyl, diphenyllmethyl, 1-naphthylmethyl, 2-naphthylmethyl, 2,2-diphenylethyl, 3-phenylpropyl, 4-phenylbutyl, 5-phenylpentyl, 2-biphenylylmethyl, 3-biphenylylmethyl, 4-biphenylylmethyl, etc.

The “C₁₋₆ alkoxy” in the “optionally substituted C₁₋₆ alkoxy” in Substituent Group A includes, for example, methoxy, ethoxy, propoxy, isopropoxy, butoxy, isobutoxy, sec-butoxy, pentyloxy, hexyloxy, etc.

The “C₆₋₁₄ aryloxy” in the “optionally substituted C₆₋₁₄ aryloxy” in Substituent Group A includes, for example, phenyloxy, 1-naphthyloxy, 2-naphthyloxy, etc.

The “C₇₋₁₆ aralkyloxy” in the “optionally substituted C₇₋₁₆ aralkyloxy” in Substituent Group A includes, for example, benzyloxy, phenethyloxy, etc.

The “C₁₋₆ alkylthio” in the “optionally substituted C₁₋₆ alkylthio” in Substituent Group A includes, for example, methylthio, ethylthio, propylthio, isopropylthio, butylthio, sec-butylthio, tert-butylthio, etc.

The “C₆₋₁₄ arylthio” in the “optionally substituted C₆₋₁₄ arylthio” in Substituent Group A includes, for example, phenylthio, 1-naphthylthio, 2-naphthylthio, etc.

The “C₇₋₁₆ aralkylthio” in the “optionally substituted C₇₋₁₆ aralkylthio” in Substituent Group A includes, for example, benzylthio, phenethylthio, etc.

The substituents in these “C₁₋₆ alkoxy-carbonyl,” “C₁₋₆ alkyl group,” “C₂₋₆ alkenyl,” “C₂₋₆ alkynyl,” “C₁₋₆ alkoxy,” “C₁₋₆ alkylthio,” “C₁₋₆ alkyl-amino,” “C₂₋₆ alkenyl-amino,” “C₂₋₆ alkynyl-amino,” C₁₋₆ alkoxy-amino,” “C₁₋₆ alkyl-carbonyl,” “C₁₋₆ alkylsulfonyl,” “C₁₋₆ alkylsulfinyl,” “C₁₋₆ alkyl-carbonylamino,” “C₁₋₆ alkoxy-carbonylamino,” “C₁₋₆ alkylsulfonylamino,” “C₁₋₆ alkyl-carbonyloxy,” “C₁₋₆-alkoxy-carbonyloxy,” “mono-C₁₋₆ alkylcarbamoyloxy” and “di-C₁₋₆ alkylcarbamoyloxy” in Substituent Group A include, for example, 1 to 5 substituents selected from, for example, a halogen atom (e.g., fluorine atom, chlorine atom, bromine atom, iodine atom), carboxy, hydroxy, amino, mono- or di-C₁₋₆ alkylamino, mono- or di-C₆₋₁₄ arylamino, C₃₋₈ cycloalkyl, C₁₋₆ alkoxy, C₁₋₆ alkoxy-carbonyl, C₁₋₆ alkylthio, C₁₋₆ alkylsulfinyl, C₁₋₆ alkylsulfonyl, the optionally esterified carboxyl described above, carbamoyl, thiocarbamoyl, mono-C₁₋₆ alkylcarbamoyl (e.g., methylcarbamoyl, ethylcarbamoyl, etc.), di-C₁₋₆ alkylcarbamoyl (e.g., dimethylcarbamoyl, diethylcarbamoyl, ethylmethylcarbamoyl, etc.), mono- or di-C₆₋₁₄ arylcarbamoyl (e.g., phenylcarbamoyl, 1-naphthylcarbamoyl, 2-naphthylcarbamoyl, etc.), mono- or di-5- to 7-membered heterocyclic carbamoyl containing 1 to 4 hetero atoms of 1 or 2 species selected from nitrogen, sulfur and oxygen atoms in addition to carbon atoms (e.g., 2-pyridylcarbamoyl, 3-pyridylcarbamoyl, 4-pyridylcarbamoyl, 2-thienylcarbamoyl, 3-thienylcarbamoyl, etc.), and the like.

The substituents for the “C₆₋₁₄ aryloxy-carbonyl,” “C₇₋₁₆ aralkyloxy-carbonyl,” “C₃₋₈ cycloalkyl,” “C₆₋₁₄ aryl,” “C₇₋₁₆ aralkyl,” “C₆₋₁₄ aryloxy,” “C₇₋₁₆ aralkyloxy,” “C₆₋₁₄ arylthio,” “C₇₋₁₆ aralkylthio,” “C₃₋₈ cycloalkyl-amino,” “C₆₋₁₄ aryl-amino,” “C₃₋₈ cycloalkyl-carbonyl,” “C₆₋₁₄ aryl-carbonyl,” “C₇₋₁₆ aralkyl-carbonyl,” “5- to 7-membered heterocyclic carbonyl containing 1 to 4 hetero atoms of 1 or 2 species selected from nitrogen, sulfur and oxygen atoms in addition to carbon atoms,” “C₆₋₁₄ arylsulfonyl,” “C₆₋₁₄ arylsulfinyl,” “C₃₋₈ cycloalkyl-carbonylamino,” “C₆₋₁₄ aryl-carbonylamino,” “C₆₋₁₄ arylsulfonylamino,” “C₆₋₁₄ aryl-carbonyloxy” and “mono- or di-C₆₋₁₄ aryl-carbamoyloxy” in Substituent Group A include, for example, 1 to 5 substituents selected from, for example, a halogen atom, hydroxy, carboxy, nitro, cyano, the optionally substituted C₁₋₆ alkyl described above, the optionally substituted C₂₋₆ alkenyl described above, the optionally substituted C₂₋₆ alkynyl described above, the optionally substituted C₃₋₈ cycloalkyl described above, the optionally substituted C₁₋₆ alkoxy described above, the optionally substituted C₁₋₆ alkylthio described above, the optionally substituted C₁₋₆ alkylsulfinyl described above, the optionally substituted C₁₋₆ alkylsulfonyl described above, the optionally esterified carboxyl described above, carbamoyl, thiocarbamoyl, mono-C₁₋₆ alkylcarbamoyl, di-C₁₋₆ alkylcarbamoyl, mono- or di-C₆₋₁₄ arylcarbamoyl, mono- or di-5- to 7-membered heterocyclic carbamoyl containing 1 to 4 hetero atoms of 1 or 2 species selected from nitrogen, sulfur and oxygen atoms in addition to carbon atoms, and the like.

The “optionally substituted heterocyclic group” in Substituent Group A includes, for example, a 5- to 14-membered (monocyclic, bicyclic or tricyclic) heterocyclic group containing 1 to 4 hetero atoms of 1 or 2 species selected from nitrogen, sulfur and oxygen atoms in addition to carbon atoms, which may optionally be substituted with a halogen atom, hydroxy, carboxy, nitro, cyano, the optionally substituted C₁₋₆ alkyl described above, the optionally substituted C₂₋₆ alkenyl described above, the optionally substituted C₂₋₆ alkynyl described above, the optionally substituted C₃₋₈ cycloalkyl described above, the optionally substituted C₆₋₁₄ aryl described above, the optionally substituted C₁₋₆ alkoxy described above, the optionally substituted C₁₋₆ alkylthio described above, the optionally substituted C₆₋₁₄ arylthio described above, the optionally substituted C₇₋₁₆ aralkylthio described above, the optionally substituted C₁₋₆ alkylsulfinyl described above, the optionally substituted C₆₋₁₄ arylsulfinyl described above, the optionally substituted C₁₋₆ alkylsulfonyl described above, the optionally substituted C₆₋₁₄ arylsulfonyl described above, the optionally esterified carboxyl described above, carbamoyl, thiocarbamoyl, mono-C₁₋₆ alkylcarbamoyl, di-lower alkylcarbamoyl, mono- or di-C₆₋₁₄ arylcarbamoyl, mono- or di-5- or 7-membered heterocyclic carbamoyl containing 1 to 4 hetero atoms of 1 or 2 species selected from nitrogen, sulfur and oxygen atoms in addition to carbon atoms, or the like; preferably (i) a 5- to 14-membered (preferably, 5- to 10-membered) aromatic heterocyclic group, (ii) a 5- to 10-membered non-aromatic heterocyclic group or (iii) a monovalent group formed by removing one optional hydrogen atom from 7- to 10-membered bridged-hetero ring, and the like, are employed; among others, preferably used is a 5-membered aromatic heterocyclic group. Specifically used are an aromatic heterocyclic group such as thienyl (e.g., 2-thienyl, 3-thienyl), furyl (e.g., 2-furyl, 3-furyl), pyridyl (e.g., 2-pyridyl, 3-pyridyl, 4-pyridyl), thiazolyl (e.g., 2-thiazolyl, 4-thiazolyl, 5-thiazolyl), oxazolyl (e.g., 2-oxazolyl, 4-oxazolyl), quinolyl (e.g., 2-quinolyl, 3-quinolyl, 4-quinolyl, 5-quinolyl, 8-quinolyl), isoquinolyl (e.g., 1-isoquinolyl, 3-isoquinolyl, 4-isoquinolyl, 5-isoquinolyl), pyrazinyl, pyrimidinyl (e.g., 2-pyrimidinyl, 4-pyrimidinyl), pyrrolyl (e.g., 1-pyrrolyl, 2-pyrrolyl, 3-pyrrolyl), imidazolyl (e.g., 1-imidazolyl, 2-imidazolyl, 4-imidazolyl), pyrazolyl (e.g., 1-pyrazolyl, 3-pyrazolyl, 4-pyrazolyl), pyridazinyl (e.g., 3-pyridazinyl, 4-pyridazinyl), isothiazolyl (e.g., 3-isothiazolyl), isoxazolyl (e.g., 3-isoxazolyl), indolyl (e.g., 1-indolyl, 2-indolyl, 3-indolyl), 2-benzothiazolyl, benzo[b]thienyl, (e.g., 2-benzo[b]thienyl, 3-benzo[b]thienyl), benzo[b]furanyl (e.g., 2-benzo[b]furanyl, 3-benzo[b]furanyl), etc., a non-aromatic heterocyclic group such as pyrrolidinyl (e.g., 1-pyrrolidinyl, 2-pyrrolidinyl, 3-pyrrolidinyl), oxazolidinyl (e.g., 2-oxazolidinyl), imidazolinyl (e.g., 1-imidazolinyl, 2-imidazolinyl, 4-imidazolinyl), piperidinyl (e.g., 1-piperidinyl, 2-piperidinyl, 3-piperidinyl, 4-piperidinyl), piperazinyl (e.g., 1-piperazinyl, 2-piperazinyl), morpholino, thiomorpholino, etc.

The “optionally substituted carbamoyl group” in Substituent Group A includes a carbamoyl group, which may optionally be substituted with the optionally substituted C₁₋₆ alkyl, optionally substituted C₂₋₆ alkenyl, an optionally substituted C₂₋₆ alkynyl, an optionally substituted C₃₋₈ cycloalkyl, an optionally substituted C₆₋₁₄ aryl, an optionally substituted heterocyclic group described above, etc., and specific examples are carbamoyl, thiocarbamoyl, mono-C₁₋₆ alkylcarbamoyl (e.g., methylcarbamoyl, ethylcarbamoyl, etc.), di-C₁₋₆ alkylcarbamoyl (e.g., dimethylcarbamoyl, diethylcarbamoyl, ethylmethylcarbamoyl, etc.), C₁₋₆ alkyl (C₁₋₆ alkoxy)carbamoyl (e.g., methyl(methoxy)carbamoyl, ethyl(methoxy)carbamoyl), mono- or di-C₆₋₁₄ arylcarbamoyl (e.g., phenylcarbamoyl, 1-naphthylcarbamoyl, 2-naphthylcarbamoyl, etc.), mono- or di-5- to 7-membered heterocyclic carbamoyl containing 1 to 4 hetero atoms of 1 or 2 species selected from nitrogen, sulfur and oxygen atoms in addition to carbon atoms (e.g., 2-pyridylcarbamoyl, 3-pyridylcarbamoyl, 4-pyridylcarbamoyl, 2-thienylcarbamoyl, 3-thienylcarbamoyl, etc.), 5- to 7-membered cyclic carbamoyl (e.g., 1-pyrrolidinylcarbonyl, 1-piperidinylcarbonyl, hexamethyleneiminocarbonyl), and the like.

The “optionally substituted amino” in Substituent Group A includes an amino, which may optionally be substituted with 1 or 2 groups selected from the optionally substituted C₁₋₆ alkyl described above, the optionally substituted C₂₋₆ alkenyl described above, the optionally substituted C₂₋₆ alkynyl described above, the optionally substituted C₃₋₈ cycloalkyl described above, the optionally substituted C₆₋₁₄ aryl described above, the optionally substituted C₁₋₆ alkoxy described above, formyl, the optionally substituted C₁₋₆ alkyl-carbonyl described above, the optionally substituted C₃₋₈ cycloalkyl-carbonyl described above, the optionally substituted C₆₋₁₄ aryl-carbonyl described above, the optionally substituted C₁₋₆ alkoxy-carbonyl described above, the optionally substituted C₁₋₆ alkylsulfonyl described above, the optionally substituted C₆₋₁₄ arylsulfonyl, and the like.

More preferably, the substituents used for these “C₆₋₁₂ aromatic hydrocarbon group,” “5- to 14-membered aromatic heterocyclic group consisting of 1 to 7 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms,” “C₈₋₁₄ aromatic fused-ring group,” “5- to 14-membered aromatic fused heterocyclic group consisting of 3 to 11 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms,” “non-aromatic cyclic hydrocarbon group of carbon atoms not greater than 7” and “non-aromatic heterocyclic group of carbon atoms not greater than 7” are a halogen atom, hydroxy, C₁₋₆ alkoxy, an optionally halogenated C₁₋₆ alkyl, an optionally halogenated C₁₋₆ alkoxy, amino, nitro, cyano, etc.

Examples of R⁴ used include:

-   (1) “a C₁₋₄ alkyl group having an optionally substituted C₆₋₁₂     aromatic hydrocarbon group” such as benzyl, 2-fluorobenzyl,     3-fluorobenzyl, 4-fluorobenzyl, 4-chlorobenzyl, 3,4-difluorobenzyl,     3,4-dichlorobenzyl, pentafluorobenzyl, 4-hydroxybenzyl,     4-methoxybenzyl, 3-trifluoromethylbenzyl, 4-aminobenzyl,     4-nitrobenzyl, 4-cyanobenzyl, phenethyl, etc.; -   (2) “a C₁₋₄ alkyl group having an optionally substituted 5- to     14-membered aromatic heterocyclic group consisting of 1 to 7 carbon     atoms and hetero atoms selected from the group consisting of     nitrogen, oxygen and sulfur atoms” such as 2-pyridylmethyl,     3-pyridylmethyl, 4-pyridylmethyl, 2-thienylmethyl, 3-thienylmethyl,     4-thiazolylmethyl, etc.; -   (3) “a C₁₋₄ alkyl group having an optionally substituted C₈₋₁₄     aromatic fused-ring group” such as 1-naphthylmethyl,     2-naphthylmethyl, inden-2-ylmethyl, etc.; -   (4) “a C₁₋₄ alkyl group having an optionally substituted 5- to     14-membered aromatic fused heterocyclic group consisting of 3 to 11     carbon atoms and hetero atoms selected from the group consisting of     nitrogen, oxygen and sulfur atoms” such as 3-indolemethyl,     1-formylindol-3-ylmethyl, 3-benzo[b]thienylmethyl, 2-quinolylmethyl,     etc.; -   (5) “a C₁₋₄ alkyl group having an optionally substituted     non-aromatic cyclic hydrocarbon group of carbon atoms not greater     than 7” such as cyclohexylmethyl, cyclopentylmethyl,     indan-2-ylmethyl, etc.; -   (6) “a C₁₋₄ alkyl group having an optionally substituted     non-aromatic heterocyclic group of carbon atoms not greater than 7”     such as 4-piperidinylmethyl, tetrahydrofurfuryl,     tetrahydrofuran-2-yl, tetrahydropyran-3-yl, indolin-3-yl, etc.;     among others, preferred are benzyl, 2-fluorobenzyl, 3-fluorobenzyl,     4-fluorobenzyl, 4-hydroxybenzyl, 4-aminobenzyl, 4-nitrobenzyl,     4-chlorobenzyl, 4-methoxybenzyl, 4-cyanobenzyl,     3-trifluoromethylbenzyl, 3,4-dichlorobenzyl, 3,4-difluorobenzyl,     pentafluorobenzyl, 3-pyridylmethyl, 4-pyridylmethyl, 3-indolemethyl,     1-formylindol-3-ylmethyl, 3-benzo[b]thienylmethyl, 2-quinolylmethyl,     1-naphthylmethyl, 2-naphthylmethyl, cyclohexylmethyl, phenethyl,     etc. are preferred, especially benzyl, 2-fluorobenzyl,     3-fluorobenzyl, 4-fluorobenzyl, 4-hydroxybenzyl, 4-aminobenzyl,     4-nitrobenzyl, 4-chlorobenzyl, 4-methoxybenzyl, 4-cyanobenzyl,     3-trifluoromethylbenzyl, 3,4-dichlorobenzyl, 3,4-difluorobenzyl,     pentafluorobenzyl, 3-pyridylmethyl, 4-pyridylmethyl, 3-indolemethyl,     3-benzo[b]thienylmethyl, 1-naphthylmethyl, 2-naphthylmethyl,     cyclohexylmethyl, etc., and particularly preferably 3-indolemethyl.

Q¹ represents a C₁₋₄ alkyl group, which may optionally be substituted with a substituent (preferably, a substituent selected from the group consisting of (1), (2) and (5) described below) selected from the group consisting of:

-   (1) an optionally substituted C₆₋₁₂ aromatic hydrocarbon group, -   (2) an optionally substituted 5- to 14-membered aromatic     heterocyclic group consisting of 1 to 7 carbon atoms and hetero     atoms selected from the group consisting of nitrogen, oxygen and     sulfur atoms, -   (3) an optionally substituted C₈₋₁₄ aromatic fused-ring group, -   (4) an optionally substituted 5- to 14-membered aromatic fused     heterocyclic group consisting of 3 to 11 carbon atoms and hetero     atoms selected from the group consisting of nitrogen, oxygen and     sulfur atoms, -   (5) an optionally substituted non-aromatic cyclic hydrocarbon group     having carbon atoms not greater than 7, and, -   (6) an optionally substituted non-aromatic heterocyclic group having     carbon atoms not greater than 7; these substituents used are the     same as those given for R⁴.

Examples of Q¹ used include:

-   (1) “a C₁₋₄ alkyl group having an optionally substituted C₆₋₁₂     aromatic hydrocarbon group” such as benzyl, 2-fluorobenzyl,     3-fluorobenzyl, 4-fluorobenzyl, 4-chlorobenzyl, 3,4-difluorobenzyl,     3,4-dichlorobenzyl, pentafluorobenzyl, 4-hydroxybenzyl,     4-methoxybenzyl, 4-trifluoromethylbenzyl, 4-aminobenzyl,     4-nitrobenzyl, 4-cyanobenzyl, phenethyl, etc., -   (2) “a C₁₋₄ alkyl group having an optionally substituted 5- to     14-membered aromatic heterocyclic group consisting of 1 to 7 carbon     atoms and hetero atoms selected from the group consisting of     nitrogen, oxygen and sulfur atoms” such as 2-pyridylmethyl,     3-pyridylmethyl, 4-pyridylmethyl, 2-thienylmethyl, 3-thienylmethyl,     4-thiazolylmethyl, etc., -   (3) “a C₁₋₄ alkyl group having an optionally substituted C₈₋₁₄     aromatic fused-ring group” such as 1-naphthylmethyl,     2-naphthylmethyl, inden-2-ylmethyl, etc., -   (4) “a C₁₋₄ alkyl group having an optionally substituted 5- to     14-membered aromatic fused heterocyclic group consisting of 3 to 11     carbon atoms and hetero atoms selected from the group consisting of     nitrogen, oxygen and sulfur atoms” such as 3-indolemethyl,     1-formylindol-3-ylmethyl, 3-benzo[b]thienylmethyl, 2-quinolylmethyl,     etc., -   (5) “a C₁₋₄ alkyl group having an optionally substituted     non-aromatic cyclic hydrocarbon group having carbon atoms not     greater than 7” such as cyclohexylmethyl, cyclopentylmethyl,     indan-2-ylmethyl, etc., -   (6) “a C₁₋₄ alkyl group having an optionally substituted     non-aromatic heterocyclic group having carbon atoms not greater than     7” such as 3-piperidylmethyl, 4-piperidinylmethyl,     tetrahydrofurfuryl, tetrahydrofuran-2-yl, tetrahydropyran-3-yl,     indolin-3-yl, etc.; among others, preferably used are     cyclohexylmethyl, benzyl, 4-fluorobenzyl, 4-hydroxybenzyl,     4-methoxybenzyl, pentafluorobenzyl, 2-pyridylmethyl,     4-pyridylmethyl, 1-naphthylmethyl, 2-naphthylmethyl, 3-indolemethyl,     3-piperidylmethyl, 2-thienylmethyl, etc.; more preferably, benzyl,     4-fluorobenzyl, 4-pyridylmethyl, cyclohexylmethyl,     3-piperidylmethyl, 2-piperidylmethyl, etc., and most preferably,     benzyl and cyclohexylmethyl.

Q² represents: (1) CH₂, CO, CS or CH═CH₂, which may optionally be substituted with a C₀₋₄ alkyl group optionally substituted with a substituent selected from the group consisting of carbamoyl group, hydroxyl group, a C₁₋₃ alkoxy group, a halogen atom and an amino group, (2) NH, which may optionally be substituted with a substituent selected from the group consisting of carbamoyl group and hydroxyl group, or (3) O; among others, preferred is (1) an optionally substituted CH₂ or CH═CH₂ with one or two C₁₋₄ alkyl groups which may optionally be substituted with a substituent selected from the group consisting of carbamoyl group, hydroxyl group, a C₁₋₃ alkoxy group and an amino group.

The “C₀₋₄ alkyl group” is used to mean a bond or a C₁₋₄ alkyl group. In other words, the “C₀ alkyl group” refers to a bond (e.g., a chemical bond “-”). Accordingly, “CH₂ substituted with a C₀ alkyl group which is substituted with a substituent selected from the group consisting of carbamoyl group, hydroxyl group, a C₁₋₃ alkoxy group and amino group” represents CH₂ substituted with a substituent selected from the group consisting of carbamoyl group, hydroxyl group, a C₁₋₃ alkoxy group and amino group.

The “C₀₋₄ alkyl group” is preferably a C₁₋₄ alkyl group.

The “C₁₋₄ alkyl group” used includes, for example, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl, etc.

The “C₁₋₃ alkoxy group” used includes, for example, methoxy group, ethoxy group, propoxy group, isopropoxy group, butoxy group, isobutoxy group, sec-butoxy group, tert-butoxy group, etc.

Preferred Q² are CH₂, CH(CH₃), CH(CH₂OH), C(CH₃)₂, CH₂CH₃, CH(CH₂CH₃), CH(CH₂NH₂), CH(CH₂OCH₃), CH(CH(CH₃)₂), NH, and the like, more preferably, CH₂, CH(CH₃), CH(CH₂OH), C(CH₃)₂, CH₂CH₃, CH(CH₂CH₃), CH(CH₂NH₂), CH(CH₂OCH₃) and CH(CH(CH₃)₂).

Y represents:

-   (1) a group represented by formula: -CONH-, -CSNH-, -CH₂NH-, -NHCO-,     -CH₂O-, -COCH₂-, -CH₂S-, -CSCH₂-, -CH₂SO-, -CH₂SO₂-, -COO-, -CSO-,     -CH₂CH₂- or -CH═CH-, which may optionally be substituted with a     substituent selected from the group consisting of a C₁₋₆ alkyl     group, hydroxyl group and a halogen atom; -   (2) an optionally substituted C₆₋₇ aromatic hydrocarbon group; -   (3) an optionally substituted 4- to 7-membered aromatic heterocyclic     group consisting of 1 to 5 carbon atoms and hetero atoms selected     from the group consisting of nitrogen, oxygen and sulfur atoms; -   (4) an optionally substituted non-aromatic cyclic hydrocarbon group     having carbon atoms not greater than 5; or -   (5) an optionally substituted non-aromatic heterocyclic group having     carbon atoms not greater than 5 and when Y is (2), (3), (4) or (5),     Q² may be a chemical bond.

The “C₁₋₆ alkyl group” used includes, for example, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl, pentyl, isopentyl, neopentyl, hexyl, etc.

Y includes (1) a group represented by formula: -CONH-, -CSNH-, -NHCO-, -CH₂NH-, -CH₂O-, -CH₂S-, -COO-, -CSO-, -COCH₂-, -CH₂CH₂- or -CH═CH-, which may optionally be substituted with a substituent selected from the group consisting of a C₁₋₆ alkyl group, hydroxyl group and a halogen atom (among others, preferred are the group represented by formula: -CONH-, -CSNH-, -NHCO-, -CH₂NH-, -CH₂O-, -CH₂S-, -COO-, -CSO-, -COCH₂-, -CH₂CH₂-, -CH(OH)CH₂- or -CH═CH-, especially the group represented by formula: -CONH-, -CSNH-, -NHCO-, -CH₂NH-, -CH₂O-, -COCH₂-, -CH₂CH₂-, -CH(OH)CH₂- or -CH═CH-, more preferably, the group represented by formula: -CONH-, -CSNH-, -NHCO-, -CH₂O-, -CH₂S-, -COCH₂-, -CH═CH- or -CH₂CH₂-).

A represents:

-   (1) a nitrogen atom substituted with hydrogen atom or a C₁₋₃ alkyl     group; -   (2) a carbon atom substituted with hydrogen atom or a C₁₋₃ alkyl     group; -   (3) O; or -   (4) S.

A preferably includes (1) a nitrogen atom substituted with hydrogen atom or a C₁₋₃ alkyl group (among others, a nitrogen atom substituted with hydrogen atom); (2) a carbon atom substituted with hydrogen atom or a C₁₋₃ alkyl group (among others, a carbon atom substituted with hydrogen atom); or (4) S.

A′ represents:

-   (1) a carbon atom, which may optionally be substituted with hydrogen     atom, O, S, a halogen atom, an optionally halogenated C₁₋₃ alkyl     group, carbamoyl group or hydroxyl group; -   (2) a nitrogen atom, which may optionally be substituted with     hydrogen atom or an optionally halogenated C₁₋₃ alkyl group; -   (3) O; or -   (4) S;

Preferably A′ includes (1) a carbon atom, which may optionally be substituted with hydrogen atom, O, S, a halogen atom, an optionally halogenated C₁₋₃ alkyl group, carbamoyl group or hydroxyl group (among others, a carbon atom substituted with hydrogen atom or O).

Preferably V′ is the group represented by the formula below.

P and P′, which may be the same or different, each may form a ring by combining P and P′ or P and Q¹ together and represents:

-   (1) hydrogen atom, -   (2) an optional amino acid residue continuously or discontinuously     bound from the C-terminal end of the 1-48 amino acid sequence in the     amino acid sequence represented by SEQ ID NO: 1 (54 amino acid     residues of human metastin); -   (3) a group represented by formula:     J¹-J²-C(J³)(Q³)Y¹C(J⁴)(Q⁴)Y²C(J⁵)(Q⁵)Y³C(J⁶)(Q⁶)C(═Z¹⁰)—     (wherein each symbol has the same significance as described above), -   (4) a group represented by formula:     -J¹-J²-C(J⁷)(Q⁷)Y²C(J⁸)(Q⁸)Y³C(J⁹)(Q⁹)C(═Z¹⁰)—     (wherein each symbol has the same significance as described above), -   (5) a group represented by formula:     J¹-J²-C(J¹⁰)(Q¹⁰)Y³C(J¹¹)(Q¹¹)C(═Z¹⁰)—     (wherein each symbol has the same significance as described above), -   (6) a group represented by formula:     J¹-J²-C(J¹²)(Q¹²)C(═Z¹⁰)—     (wherein each symbol has the same significance as described above),     or, -   (7) a group represented by formula: J¹-     (wherein J¹ 1 has the same significance as described above).

Specific examples of the “optional amino acid residue continuously or discontinuously bound from the C-terminal end of the 1-48 amino acid sequence in the amino acid sequence represented by SEQ ID NO: 12,” which are employed, include:

(1) Asn- (2) Trp Asn-, (3) Asn Trp Asn-, (SEQ ID NO: 23) (4) Tyr Asn Trp Asn-, (SEQ ID NO: 24) (5) Asn Tyr Asn Trp Asn-, (SEQ ID NO: 25) (6) Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 26) (7) Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 27) (8) Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 28) (9) Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 29) (10) Glu Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 30) (11) Arg Glu Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 31) (12) Gln Arg Glu Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 32) (13) Val Gln Arg Glu Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 33) (14) Leu Val Gln Arg Glu Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 34) (15) Val Leu Val Gln Arg Glu Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 35) (16) Ala Val Leu Val Gln Arg Glu Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 36) (17) Gly Ala Val Leu Val Gln Arg Glu Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 37) (18) Gln Gly Ala Val Leu Val Gln Arg Glu Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 38) (19) Pro Gln Gly Ala Val Leu Val Gln Arg Glu Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 39) (20) Ala Pro Gln Gly Ala Val Leu Val Gln Arg Glu Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 40) (21) Pro Ala Pro Gln Gly Ala Val Leu Val Gln Arg Glu Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 41) (22) Ile Pro Ala Pro Gln Gly Ala Val Leu Val Gln Arg Glu Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 42) (23) Gln Ile Pro Ala Pro Gln Gly Ala Val Leu Val Gln Arg Glu Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 43) (24) Arg Gln Ile Pro Ala Pro Gln Gly Ala Val Leu Val Gln Arg Glu Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 44) (25) Ser Arg Gln Ile Pro Ala Pro Gln Gly Ala Val Leu Val Gln Arg Glu Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 45) (26) His Ser Arg Gln Ile Pro Ala Pro Gln Gly Ala Val Leu Val Gln Arg Glu Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 46) (27) Pro His Ser Arg Gln Ile Pro Ala Pro Gln Gly Ala Val Leu Val Gln Arg Glu Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 47) (28) Ala Pro His Ser Arg Gln Ile Pro Ala Pro Gln Gly Ala Val Leu Val Gln Arg Glu Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 48) (29) Ser Ala Pro His Ser Arg Gln Ile Pro Ala Pro Gln Gly Ala Val Leu Val Gln Arg Glu Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 49) (30) Leu Ser Ala Pro His Ser Arg Gln Ile Pro Ala Pro Gln Gly Ala Val Leu Val Gln Arg Glu Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 50) (31) Gly Leu Ser Ala Pro His Ser Arg Gln Ile Pro Ala Pro Gln Gly Ala Val Leu Val Gln Arg Glu Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 51) (32) Pro Gly Leu Ser Ala Pro His Ser Arg Gln Ile Pro Ala Pro Gln Gly Ala Val Leu Val Gln Arg Glu Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 52) (33) Gln Pro Gly Leu Ser Ala Pro His Ser Arg Gln Ile Pro Ala Pro Gln Gly Ala Val Leu Val Gln Arg Glu Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 53) (34) Gln Gln Pro Gly Leu Ser Ala Pro His Ser Arg Gln Ile Pro Ala Pro Gln Gly Ala Val Leu Val Gln Arg Glu Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 54) (35) Arg Gln Gln Pro Gly Leu Ser Ala Pro His Ser Arg Gln Ile Pro Ala Pro Gln Gly Ala Val Leu Val Gln Arg Glu Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 55) (36) Ser Arg Gln Gln Pro Gly Leu Ser Ala Pro His Ser Arg Gln Ile Pro Ala Pro Gln Gly Ala Val Leu Val Gln Arg Glu Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 56) (37) Gly Ser Arg Gln Gln Pro Gly Leu Ser Ala Pro His Ser Arg Gln Ile Pro Ala Pro Gln Gly Ala Val Leu Val Gln Arg Glu Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 57) (38) Ser Gly Ser Arg Gln Gln Pro Gly Leu Ser Ala Pro His Ser Arg Gln Ile Pro Ala Pro Gln Gly Ala Val Leu Val Gln Arg Glu Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 58) (39) Ser Ser Gly Ser Arg Gln Gln Pro Gly Leu Ser Ala Pro His Ser Arg Gln Ile Pro Ala Pro Gln Gly Ala Val Leu Val Gln Arg Glu Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 59) (40) Glu Ser Ser Gly Ser Arg Gln Gln Pro Gly Leu Ser Ala Pro His Ser Arg Gln Ile Pro Ala Pro Gln Gly Ala Val Leu Val Gln Arg Glu Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 60) (41) Pro Glu Ser Ser Gly Ser Arg Gln Gln Pro Gly Leu Ser Ala Pro His Ser Arg Gln Ile Pro Ala Pro Gln Gly Ala Val Leu Val Gln Arg Glu Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 61) (42) Pro Pro Glu Ser Ser Gly Ser Arg Gln Gln Pro Gly Leu Ser Ala Pro His Ser Arg Gln Ile Pro Ala Pro Gln Gly Ala Val Leu Val Gln Arg Glu Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 62) (43) Pro Pro Pro Glu Ser Ser Gly Ser Arg Gln Gln Pro Gly Leu Ser Ala Pro His Ser Arg Gln Ile Pro Ala Pro Gln Gly Ala Val Leu Val Gln Arg Glu Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 63) (44) Ser Pro Pro Pro Glu Ser Ser Gly Ser Arg Gln Gln Pro Gly Leu Ser Ala Pro His Ser Arg Gln Ile Pro Ala Pro Gln Gly Ala Val Leu Val Gln Arg Glu Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 64) (45) Leu Ser Pro Pro Pro Glu Ser Ser Gly Ser Arg Gln Gln Pro Gly Leu Ser Ala Pro His Ser Arg Gln Ile Pro Ala Pro Gln Gly Ala Val Leu Val Gln Arg Glu Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 65) (46) Ser Leu Ser Pro Pro Pro Glu Ser Ser Gly Ser Arg Gln Gln Pro Gly Leu Ser Ala Pro His Ser Arg Gln Ile Pro Ala Pro Gln Gly Ala Val Leu Val Gln Arg Glu Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 66) (47) Thr Ser Leu Ser Pro Pro Pro Glu Ser Ser Gly Ser Arg Gln Gln Pro Gly Leu Ser Ala Pro His Ser Arg Gln Ile Pro Ala Pro Gln Gly Ala Val Leu Val Gln Arg Glu Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, (SEQ ID NO: 67) (48) Gly Thr Ser Leu Ser Pro Pro Pro Glu Ser Ser Gly Ser Arg Gln Gln Pro Gly Leu Ser Ala Pro His Ser Arg Gln Ile Pro Ala Pro Gln Gly Ala Val Leu Val Gln Arg Glu Lys Asp Leu Pro Asn Tyr Asn Trp Asn-, and the like.

J¹ represents (a) hydrogen atom or (b) (i) a C₁₋₂₀ acyl group, (ii) a C₁₋₂₀ alkyl group, (iii) a C₆₋₁₄ aryl group, (iv) carbamoyl group, (v) carboxyl group, (vi) sulfino group or (vii) amidino group, (viii) glyoxyloyl group or (ix) amino group, which groups may optionally be substituted with a substituent containing an optionally substituted cyclic group;

The “cyclic group” used includes, for example, “an optionally substituted aromatic hydrocarbon group,” “an optionally substituted aromatic heterocyclic group,” “an optionally substituted aromatic fused-ring group,” “an optionally substituted aromatic fused heterocyclic group,” “an optionally substituted non-aromatic cyclic hydrocarbon group,” “an optionally substituted non-aromatic heterocyclic group,” etc., and examples of the “aromatic hydrocarbon group,” “aromatic heterocyclic group,” “aromatic fused-ring group” and “aromatic fused heterocyclic group” used are the same as those given above.

The “non-aromatic cyclic hydrocarbon group” used includes a C₃₋₈ cycloalkyl group such as cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, etc.

The “non-aromatic heterocyclic group” used includes a 5- to 10-membered non-aromatic heterocyclic group containing 1 to 4 hetero atoms of 1 or 2 species selected from nitrogen, sulfur and oxygen atoms in addition to 1 to 7 carbon atoms such as pyrrolidinyl (e.g., 1-pyrrolidinyl, 2-pyrrolidinyl, 3-pyrrolidinyl), oxazolidinyl (e.g., 2-oxazolidinyl), imidazolinyl (e.g., 1-imidazolinyl, 2-imidazolinyl, 4-imidazolinyl), piperidinyl (e.g., 1-piperidinyl, 2-piperidinyl, 3-piperidinyl, 4-piperidinyl), piperazinyl (e.g., 1-piperazinyl, 2-piperazinyl), morpholino, thiomorpholino, etc.

The substituent optionally present on the “cyclic group” includes the same substituents as Substituent Group A described above.

The “C₁₋₂₀ acyl group” used includes, for example, formyl, C₁₋₁₈ alkyl-carbonyl (e.g., C₁₋₁₈ alkyl-carbonyl such as acetyl, propionyl, pivaloyl, octanoyl, decanoyl, palmitoyl, etc.) and the like.

The “C₁₋₂₀ alkyl group” used include, for example, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl, pentyl, isopentyl, neopentyl, hexyl, heptyl, octyl, nonanyl, decanyl, tridecyl, pentadecyl, etc.

The “C₆₋₁₄ aryl group” used includes, for example, phenyl, 1-naphthyl, 2-naphthyl, biphenyl, etc.

(1) The C₁₋₁₅ acyl group, which may optionally be substituted with a substituent containing a cyclic group, includes (i) formyl, (ii) C₁₋₄ alkyl-carbonyl (e.g., C₁₋₆ alkyl-carbonyl such as acetyl, propionyl, pivaloyl, etc.), (iii) C₃₋₈ cycloalkyl-carbonyl (e.g., cyclopropylcarbonyl, cyclopentylcarbonyl, cyclohexylcarbonyl, 1-methylcyclohexylcarbonyl, etc.), (iv) C₃₋₈ cycloalkyl-C₁₋₆ alkyl-carbonyl (e.g., cyclopropylacetyl, cyclopentylacetyl, cyclohexylacetyl, etc.), (v) C₆₋₁₄ aryl-carbonyl (e.g., benzoyl, 1-naphthoyl, 2-naphthoyl, etc.), C₆₋₁₄ aralkyl-carbonyl (e.g., phenylacetyl, 3-phenylpropionyl, etc.), (vi) 5- to 7-membered monocyclic heterocyclic carbonyl containing 1 to 4 hetero atoms of 1 or 2 species selected from nitrogen, sulfur and oxygen atoms in addition to carbon atoms (e.g., nicotinoyl, isonicotinoyl, thenoyl, furoyl, morpholinocarbonyl, thiomorpholinocarbonyl, piperazin-1-ylcarbonyl, pyrrolidin-1-ylcarbonyl, etc.), (vii) 5- to 7-membered monocyclic heterocycle, which contains 1 to 4 hetero atoms of 1 or 2 species selected from nitrogen, sulfur and oxygen atoms in addition to carbon atoms, -C₁₋₆ alkylcarbonyl (e.g., 3-pyridylacetyl, 4-pyridylacetyl, 2-thienylacetyl, 2-furylacetyl, morpholinoacetyl, thiomorpholinoacetyl, piperidin-2-acetyl, pyrrolidine-2-ylacetyl, etc.), (viii) 5- to 14-membered (preferably, 5- to 10-membered) bicyclic or tricyclic aromatic heterocyclic carbonyl containing 1 to 4 hetero atoms of 1 or 2 species selected from nitrogen, sulfur and oxygen atoms in addition to 3 to 11 carbon atoms (e.g., 2-indolecarbonyl, 3-indolecarbonyl, 2-quinolylcarbonyl, 1-isoquinolylcarbonyl, 2-benzo[b]thienylcarbonyl, 2-benzo[b]furanylcarbonyl, etc.), (ix) 5- to 14-membered (preferably 5- to 10-membered) bicyclic or tricyclic aromatic heterocycle, which contains 1 to 4 hetero atoms of 1 or 2 species selected from nitrogen, sulfur and oxygen atoms in addition to 3 to 11 carbon atoms, -C₁₋₆ alkylcarbonyl (e.g., 2-indoleacetyl, 3-indoleacetyl, 2-quinolylacetyl, 1-isoquinolylacetyl, 2-benzo[b]thienylacetyl, 2-benzo[b]furanylacetyl, etc.), etc., among others, preferably used are acetyl, 2-indolecarbonyl, 3-indolecarbonyl, 3-indoleacetyl, 3-indolepropionyl, 2-indolinecarbonyl, 3-phenylpropionyl, diphenylacetyl, 2-pyridinecarbonyl, 3-pyridinecarbonyl, 4-pyridinecarbonyl, 1-pyridinioacetyl, 2-pyridineacetyl, 3-pyridineacetyl, 4-pyridineacetyl, 3-(1-pyridinio)propionyl, 3-(pyridin-2-yl)propionyl, 3-(pyridin-3-yl)propionyl, 3-(pyridin-4-yl)propionyl, 4-imidazoleacetyl, cyclohexanecarbonyl, 1-piperidineacetyl, 1-methyl-1-piperidinioacetyl, 4-piperidinecarbonyl, 2-pyrimidinecarbonyl, 4-pyrimidinecarbonyl, 5-pyrimidinecarbonyl, 2-pyrimidineacetyl, 4-pyrimidineacetyl, 5-pyrimidineacetyl, 3-(pyrimidin-2-yl)propionyl, 3-(pyrimidin-4-yl)propionyl, 3-(pyrimidin-5-yl)propionyl, butanoyl, hexanoyl, octanoyl, D-glucuronyl, amino-(4-hydroxyphenyl)acetyl), etc.

(2) The C₁₋₂₀ alkyl group (preferably, a C₁₋₇ alkyl group, more preferably, a C₁₋₁₅ alkyl group), which may optionally be substituted with a substituent containing a cyclic group, includes, for example, (i) mono- or di-C₁₋₂₀ alkyl (e.g., methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl, pentyl, isopentyl, neopentyl, hexyl, heptyl, octyl, nonanyl, decanyl, tridecyl, pentadecyl), (ii) mono- or di-C₃₋₈ cycloalkyl (e.g., cyclopropyl, cyclopentyl, etc.), (iii) mono- or di-C₃₋₈ cycloalkyl-C₁₋₁₂ (preferably, C₁₋₉, more preferably, C₁₋₇) alkyl (e.g., cyclopropylmethyl, cyclopentylmethyl, cyclohexylethyl, etc.), (iv) mono- or di-C₇₋₂₀ (preferably, C₇₋₁₇, more preferably C₇₋₁₅) aralkyl (e.g., benzyl, phenethyl, etc.), (v) mono- or di-5- to 7-membered monocyclic heterocycle, which contains 1 to 4 hetero atoms of 1 or 2 species selected from nitrogen, sulfur and oxygen atoms in addition to carbon atoms, -C₁₋₆ alkyl group (e.g., 3-pyridylmethyl, 4-pyridylmethyl, 2-thienylmethyl, furfuryl, etc.), (vi) mono- or di-5- to 14-membered (preferably, 5- to 10-membered) bicyclic or tricyclic aromatic heterocycle, which contains 1 to 4 hetero atoms of 1 or 2 species selected from nitrogen, sulfur and oxygen atoms in addition to 3 to 11 carbon atoms, -C₁₋₆ alkyl (e.g., 2-indolemethyl, 3-indolemethyl, 3-(indol-3-yl)propyl, 2-quinolylmethyl, 1-isoquinolylmethyl, 2-benzo[b]thienylmethyl, 2-benzo[b]furanylmethyl, etc.), etc.; among others, methyl, ethyl, benzyl, 3-(indol-3-yl)propyl, etc. are preferably used.

(3) The C₆₋₁₄ aryl group, which may optionally be substituted with a substituent containing a cyclic group, includes, for example, a C₆₋₁₄ aryl group (e.g., phenyl, naphthyl, biphenyl), which may optionally be substituted with (i) a C₆₋₁₄ carbocyclic group (e.g., cycloalkyl, phenyl, 1-naphthyl, 2-naphthyl, etc.), (ii) a 5- to 7-membered monocyclic heterocyclic group containing 1 to 4 hetero atoms of 1 or 2 species selected from nitrogen, sulfur and oxygen atoms in addition to carbon atoms (e.g., 3-pyridyl, 2-thienyl, etc.), (iii) a 5- to 14-membered (preferably, 5- to 10-membered) bicyclic or tricyclic aromatic heterocyclic group containing 1 to 4 hetero atoms of 1 or 2 species selected from nitrogen, sulfur and oxygen atoms in addition to 3 to 11 carbon atoms (e.g., 2-indolyl, 3-indolyl, 2-quinolyl, 1-isoquinolyl, 2-benzo[b]thienyl, 2-benzo[b]furanyl, etc.), etc.

(4) The optionally substituted carbamoyl group, which may optionally be substituted with a substituent containing a cyclic group, includes (i) carbamoyl, (ii) mono- or di-C₁₋₁₅ alkylcarbamoyl (e.g., methylcarbamoyl, ethylcarbamoyl), (iii) mono- or di-C₃₋₈ cycloalkylcarbamoyl (e.g., cyclopropylcarbamoyl, cyclopentylcarbamoyl, cyclohexylcarbamoyl, etc.), (iv) mono- or di-C₃₋₈ cycloalkyl-C₁₋₆ alkyl-carbamoyl (e.g., cyclopropylmethylcarbamoyl, cyclopentylmethylcarbamoyl, 2-cyclohexylethylcarbamoyl, etc.) (v) mono- or di-C₆₋₁₄ aryl-carbamoyl (e.g., phenylcarbamoyl, etc.), a mono- or di-C₆₋₁₄ aralkyl-carbamoyl (e.g., benzylcarbamoyl, phenethylcarbamoyl, etc.), (vi) mono- or di-5- to 7-membered monocyclic heterocyclic carbamoyl containing 1 to 4 hetero atoms of 1 or 2 species selected from nitrogen, sulfur and oxygen atoms in addition to carbon atoms (e.g., 3-pyridinecarbamoyl, 2-thiophenecarbamoyl, piperidin-3-ylcarbamoyl, etc.), (vii) mono- or di-5- to 7-membered monocyclic heterocycle, which contains 1 to 4 hetero atoms of 1 or 2 species selected from nitrogen, sulfur and oxygen atoms in addition to carbon atoms, -C₁₋₆ alkylcarbamoyl (e.g., 3-pyridylmethylcarbamoyl, 2-(pyridin-2-yl)ethylcarbamoyl, 2-(piperidin-1-yl)ethylcarbamoyl, etc.), (viii) mono- or di-5- to 14-membered (preferably, 5- to 10-membered) bicyclic or tricyclic aromatic heterocyclic carbamoyl containing 1 to 4 hetero atoms of 1 or 2 species selected from nitrogen, sulfur and oxygen atoms in addition to 3 to 11 carbon atoms (e.g., 4-indolecarbamoyl, 5-indolecarbamoyl, 3-quinolylcarbamoyl, 5-quinolylcarbamoyl, etc.), (ix) mono- or di-5- to 14-membered (preferably, 5- to 10-membered) bicyclic or tricyclic aromatic heterocyclic-C₁₋₆ alkylcarbonyl containing 1 to 4 hetero atoms of 1 or 2 species selected from nitrogen, sulfur and oxygen atoms in addition to 3 to 11 carbon atoms (e.g., benzimidazol-2-ylmethylcarbamoyl, 2-(indol-3-yl)ethylcarbamoyl, etc.), (x) 5- to 7-membered cyclic carbamoyl (e.g., 1-pyrrolidinylcarbonyl, 1-piperidinylcarbonyl, hexamethyleneiminocarbonyl, etc.), (xi) C₁₋₁₅ acylcarbamoyl (C₁₋₁₅ acyl as used herein has the same significance as the “C₁₋₁₅ acyl group” in the “C₁₋₁₅ acyl group, which may optionally be substituted with a substituent containing a cyclic group”), (xii) C₁₋₁₅ alkylaminocarbamoyl (C₁₋₁₅ alkyl as used herein has the same significance as the “C₁₋₁₅ alkyl group” in the “C₁₋₁₅ alkyl group, which may optionally be substituted with a substituent containing a cyclic group”), (xiii) C₆₋₁₄ arylaminocarbamoyl (C₆₋₁₄ aryl as used herein has the same significance as “C₆₋₁₄ aryl group, which may optionally be substituted with a substituent containing a cyclic group”), etc.; among others, 2-(indol-3-yl)ethylcarbamoyl, etc. are preferably used.

(5) The carboxyl group, which may optionally be substituted with a substituent containing a cyclic group, includes (i) C₁₋₁₅ alkyloxycarbonyl (C₁₋₁₅ alkyl herein has the same significance as the “C₁₋₁₅ alkyl group” in the “C₁₋₁₅ alkyl group, which may optionally be substituted with a substituent containing a cyclic group,” e.g., tert-butyloxycarbonyl, benzyloxycarbonyl, 9-fluorenylmethoxycarbonyl), (ii) C₆₋₁₄ aryloxycarbonyl (C₆₋₁₄ aryl herein has the same significance as the “C₆₋₁₄ aryl group” in the “C₆₋₁₄ aryl group, which may optionally be substituted with a substituent containing a cyclic group,” e.g., phenoxycarbonyl), etc.

(6) The sulfino group, which may optionally be substituted with a substituent containing a cyclic group, includes (i) C₁₋₁₅ alkylsulfonyl (C₁₋₁₅ alkyl as used herein has the same significance as the “C₁₋₁₅ alkyl group” in the “C₁₋₁₅ alkyl group, which may optionally be substituted with a substituent containing a cyclic group,” e.g., benzylsulfonyl), (ii) C₆₋₁₄ arylsulfonyl (C₆₋₁₄ aryl as used herein has the same significance as the “C₆₋₁₄ aryl group” in the “C₆₋₁₄ aryl group, which may optionally be substituted with a substituent containing a cyclic group,” e.g., tosyl), etc.

(7) The amidino group, which may optionally be substituted with a substituent containing a cyclic group, includes (i) amidino, (ii) C₁₋₁₅ alkylamidino (C₁₋₁₅ alkyl as used herein has the same significance as the “C₁₋₁₅ alkyl group” in the “C₁₋₁₅ alkyl group, which may optionally be substituted with a substituent containing a cyclic group,” e.g., N-methylamidino), (iii) C₁₋₁₅ acylamidino (C₁₋₁₅ acyl as used herein has the same significance as the “C₁₋₁₅ acyl group” in the “C₁₋₁₅ acyl group, which may optionally be substituted with a substituent containing a cyclic group,” e.g., N-acetylamidino), etc.

(8) The glyoxyloyl group, which may optionally be substituted with a substituent containing a cyclic group, includes (i) C₁₋₁₅ alkyloxalyl (C₁₋₁₅ alkyl as used herein has the same significance as the “C₁₋₁₅ alkyl group” in the “C₁₋₁₅ alkyl group, which may optionally be substituted with a substituent containing a cyclic group,” e.g., ethyloxalyl), (ii) C₆₋₁₄ aryloxalyl (C₆₋₁₄ aryl as used herein has the same significance as the “C₆₋₁₄ aryl group” in the “C₆₋₁₄ aryl group, which may optionally be substituted with a substituent containing a cyclic group,” e.g., phenyloxalyl), etc.

(9) The amino group, which may optionally be substituted with a substituent containing a cyclic group, includes (i) C₁₋₁₅ alkylamino (C₁₋₁₅ alkyl as used herein has the same significance as the “C₁₋₁₅ alkyl group” in the “C₁₋₁₅ alkyl group, which may optionally be substituted with a substituent containing a cyclic group”).

Among those described above, preferred examples of J¹ used include hydrogen atom, formyl, acetyl, 3-indolecarbonyl, 3-(indol-3-yl)propionyl, 3-phenylpropionyl, diphenylacetyl, 3-(pyridin-3-yl)propionyl, 4-imidazoleacetyl, cyclohexanecarbonyl, 1-piperidineacetyl, 1-methyl-1-piperidinioacetyl, 4-piperidinecarbonyl, hexanoyl, amino-(4-hydroxyphenyl)acetyl, D-glucuronyl, 2-(indol-3-yl)ethylcarbamoyl, tert-butyloxycarbonyl, 9-fluorenylmethoxycarbonyl, amidino, 4-guanidomethylbenzoyl, benzoyl, 3-indoleacetyl, benzyloxycarbonyl, tosyl, phenyl, benzyl, phenethyl, 3-pyridinecarbonyl, 2-pyridinecarbonyl, 4-pyridinecarbonyl, propionyl, isobutyryl, phenylacetyl, 2-methylnicotinoyl, 5-methylnicotinoyl, 6-methylnicotinoyl, pyrazinecarbonyl, cyclopropanecarbonyl, trifluoroacetyl, (R)-3-hydroxy-2-methylpropionyl, 2-hydroxyisobutyryl, 3-furancarbonyl, pyrrole-2-carbonyl, 4-imidazolecarbonyl, 6-hydroxynicotinoyl, 6-chloronicotinoyl, 6-(trifluoromethyl)nicotinoyl, dimethylcarbamoyl, 1-azetidinecarbonyl, 2-azetidinecarbonyl, 4-aminobenzoyl, 4-aminomethylbenzoyl, pyrrole-3-carbonyl, pyrimidine-4-carbonyl, pyrimidine-2-carbonyl, pyridazine-4-carbonyl, 6-aminocaproyl, glycyl, glycylglycyl, glycylglycylglycyl, alanylalanylalanyl, alanylalanylalanylalanyl, acetylglycyl, acetylglycylglycyl, acetylglycylglycylglycyl, acetylalanylalanylalanyl, acetylalanylalanylalanylalanyl, D-arginylglycyl, D-arginylglycylglycyl, D-arginylglycylglycylglycyl, D-arginylalanylalanylalanyl, D-arginylalanylalanylalanylalanyl, acetyl-D-arginylglycyl, acetyl-D-arginylglycylglycyl, acetyl-D-arginylglycylglycylglycyl, acetyl-D-arginylalanylalanylalanyl, acetyl-D-arginylalanylalanylalanylalanyl, cyclopropanecarbonyl, cyclopentanecarbonyl, cyclobutanecarbonyl, cyclohexanecarbonyl, 1-naphthoyl, 2-naphthoyl, arginyl, arginylarginyl, 6-(arginylamino)caproyl, 6-(D-arginylamino)caproyl, 6-(D-arginyl-D-arginylamino)caproyl, 6-(acetyl-D-arginylamino)caproyl, 6-((R)-2,3-diaminopropionylamino)caproyl, 6-(D-norleucylamino)caproyl, 3-(D-arginylamino)propionyl, 4-(D-arginylamino)butyryl, 4-(D-arginyl-D-arginylamino)butyryl, 4-(D-arginyl-D-arginyl-D-arginylamino)butyryl, 3-(4-hydroxyphenyl)propionyl, butyryl, methyl, adipoyl, pyroglutamyl, glycoloyl, etc.; among others, preferred are hydrogen atom, formyl, acetyl, propionyl, 3-indolecarbonyl, 3-(indol-3-yl)propionyl, 3-phenylpropionyl, 3-(pyridin-3-yl)propionyl, 4-imidazoleacetyl, cyclohexanecarbonyl, hexanoyl, amino-(4-hydroxyphenyl)acetyl, 2-(indol-3-yl)ethylcarbamoyl, 9-fluorenylmethoxycarbonyl, amidino, 4-guanidomethylbenzoyl, benzoyl, 3-indoleacetyl, benzyl, phenethyl, 3-pyridinecarbonyl, 2-pyridinecarbonyl, 4-pyridinecarbonyl, isobutyryl, phenylacetyl, 6-methylnicotinoyl, pyrazinecarbonyl, cyclopropanecarbonyl, trifluoroacetyl, (R)-3-hydroxy-2-methylpropionyl, 2-hydroxyisobutyryl, 3-furancarbonyl, pyrrole-2-carbonyl, 4-imidazolecarbonyl, 6-hydroxynicotinoyl, 6-chloronicotinoyl, 6-(trifluoromethyl)nicotinoyl, dimethylcarbamoyl, 1-azetidinecarbonyl, 4-aminobenzoyl, 4-aminomethylbenzoyl, pyrrole-3-carbonyl, pyrimidine-4-carbonyl, pyrimidine-2-carbonyl, pyridazine-4-carbonyl, 6-aminocaproyl, cyclopropanecarbonyl, 2-naphthoyl, arginyl, 6-(arginylamino)caproyl, 6-(D-arginylamino)caproyl, 6-(D-arginyl-D-arginylamino)caproyl, 6-(acetyl-D-arginylamino)caproyl, 6-((R)-2,3-diaminopropionylamino)caproyl, 6-(D-norleucylamino)caproyl, 3-(D-arginylamino)propionyl, 4-(D-arginylamino)butyryl, 4-(D-arginyl-D-arginylamino)butyryl, 4-(D-arginyl-D-arginyl-D-arginylamino)butyryl, 3-(4-hydroxyphenyl)propionyl, butyryl, adipoyl, pyroglutamyl, etc., and acetyl is particularly preferred.

J² represents (1) NH optionally substituted with a C₁₋₆ alkyl group, (2) CH₂ optionally substituted with a C₁₋₆ alkyl group, (3) O or (4) S.

The “C₁₋₆ alkyl group” used includes methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl, pentyl, isopentyl, neopentyl, hexyl, etc.

Preferably, J² is NH.

Each of J³ through J¹² represents hydrogen atom or a C₁₋₃ alkyl group.

The “C₁₋₃ alkyl group” used includes methyl, ethyl, propyl, isopropyl, etc.

Preferably, J³ is hydrogen atom.

Preferably, J⁴ is hydrogen atom.

Preferably, J⁵ is hydrogen atom.

Preferably, J⁶ is hydrogen atom.

Preferably, J⁷ is hydrogen atom.

Preferably, J⁸ is hydrogen atom.

Preferably, J⁹ is hydrogen atom.

Preferably, J¹⁰ is hydrogen atom.

Preferably, J¹¹ is hydrogen atom.

Preferably, J¹² is hydrogen atom.

Each of Q³ through Q¹² represents a C₁₋₄ alkyl group, which may optionally be substituted with a substituent selected from the group consisting of:

(1) an optionally substituted C₆₋₁₂ aromatic hydrocarbon group,

(2) an optionally substituted 5- to 14-membered aromatic heterocyclic group consisting of 1 to 7 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms,

(3) an optionally substituted C₈₋₁₄ aromatic fused-ring group,

(4) an optionally substituted 5- to 14-membered aromatic fused heterocyclic group consisting of 3 to 11 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms,

(5) an optionally substituted non-aromatic cyclic hydrocarbon group having carbon atoms not greater than 7,

(6) an optionally substituted non-aromatic heterocyclic group having carbon atoms not greater than 7,

(7) an optionally substituted amino group;

(8) an optionally substituted guanidino group;

(9) an optionally substituted hydroxyl group;

(10) an optionally substituted carboxyl group;

(11) an optionally substituted carbamoyl group; and,

(12) an optionally substituted sulfhydryl group; or hydrogen atom.

Particularly preferred Q³ to Q⁹ are a C₁₋₄ alkyl group having a substituent selected from the group consisting of:

(1) an optionally substituted C₆₋₁₂ aromatic hydrocarbon group,

(2) an optionally substituted 5- to 14-membered aromatic heterocyclic group consisting of 1 to 7 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms,

(3) an optionally substituted C₈₋₁₄ aromatic fused-ring group,

(4) an optionally substituted 5- to 14-membered aromatic fused heterocyclic group consisting of 3 to 11 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms,

(5) an optionally substituted non-aromatic cyclic hydrocarbon group having carbon atoms not greater than 7,

(6) an optionally substituted non-aromatic heterocyclic group having carbon atoms not greater than 7,

(7) an optionally substituted amino group;

(8) an optionally substituted guanidino group;

(9) an optionally substituted hydroxyl group;

(10) an optionally substituted carboxyl group;

(11) an optionally substituted carbamoyl group; and,

(12) an optionally substituted sulfhydryl group, or hydrogen atom.

The “optionally substituted C₆₋₁₂ aromatic hydrocarbon group,” “optionally substituted 5- to 14-membered aromatic heterocyclic group consisting of 1 to 7 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms,” “optionally substituted C₈₋₁₄ aromatic fused-ring group,” “optionally substituted 5- to 14-membered aromatic fused heterocyclic group consisting of 3 to 11 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms,” “optionally substituted non-aromatic cyclic hydrocarbon group having carbon atoms not greater than 7” and “optionally substituted non-aromatic heterocyclic group having carbon atoms not greater than 7” used are the same as those given above.

(1) As the C₁₋₄ alkyl group having an optionally substituted C₆₋₁₂ aromatic hydrocarbon group, there are used, for example, benzyl, 4-hydroxybenzyl, 2-chlorobenzyl, 3-chlorobenzyl, 4-chlorobenzyl, 4-aminobenzyl, etc.

(2) As the C₁₋₄ alkyl group having an optionally substituted 5- to 14-membered aromatic heterocyclic group consisting of 1 to 7 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms, there are used, for example, 2-pyridylmethyl, 3-pyridylmethyl, 4-pyridylmethyl, 4-imidazolemethyl, etc.

(3) As the C₁₋₄ alkyl group having an optionally substituted C₈₋₁₄ aromatic fused-ring group, there are used, for example, 1-naphthylmethyl, 2-naphthylmethyl, etc.

(4) As the C₁₋₄ alkyl group having an optionally substituted 5- to 14-membered aromatic fused heterocyclic group consisting of 3 to 11 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms, there are used, for example, 3-indolemethyl, 1-formylindol-3-ylmethyl, 2-quinolylmethyl, etc.

(5) As the C₁₋₄ alkyl group having an optionally substituted non-aromatic cyclic hydrocarbon group having carbon atoms not greater than 7, there are used, for example, cyclohexylmethyl, etc.

(6) As the C₁₋₄ alkyl group having an optionally substituted non-aromatic heterocyclic group having carbon atoms not greater than 7, there are used, for example, piperidin-1-ylmethyl, etc.

(7) As the C₁₋₄ alkyl group having an optionally substituted amino group, there are used, for example, 2-aminoethyl, 3-aminopropyl, 4-aminobutyl, 4-acetamidobutyl, etc.

(8) As the C₁₋₄ alkyl group having an optionally substituted guanidino group, there are used, for example, 3-guanidinopropyl, 3-(N-tosyl)guanidinopropyl, etc.

(9) As the C₁₋₄ alkyl group having an optionally substituted hydroxyl group, there are used, for example, hydroxymethyl, 1-hydroxyethyl, benzyloxymethyl, etc.

(10) As the C₁₋₄ alkyl group having an optionally substituted carboxyl group, there are used, for example, carboxylmethyl, 2-carboxylethyl, benzyloxycarbonylmethyl, etc.

(11) As the C₁₋₄ alkyl group having an optionally substituted carbamoyl group, there are used, for example, carbamoylmethyl, 2-carbamoylethyl, xanthylcarbamoyl, etc.

(12) As the C₁₋₄ alkyl group having an optionally substituted sulfhydryl group, there are used, for example, sulfhydrylmethyl, 2-(methylsulfhydryl)ethyl, etc.

(13) As the unsubstituted C₁₋₄ alkyl group, there are used, for example, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl, etc.

Preferred examples of Q³ used include hydrogen atom, 4-hydroxybenzyl, 3-pyridylmethyl, 4-pyridylmethyl, methyl, isobutyl, hydroxymethyl, carboxymethyl, 4-aminobutyl, etc., particularly preferably, 4-hydroxybenzyl, 3-pyridylmethyl, 4-pyridylmethyl, etc.

Preferred examples of Q⁴ used include carbamoylmethyl, 2-carbamoylethyl, 4-hydroxybenzyl, 4-imidazolemethyl, isobutyl, hydroxymethyl, 1-hydroxyethyl, carboxymethyl, 4-aminobutyl, etc., particularly preferably, carbamoylmethyl, 2-carbamoylethyl, 4-hydroxybenzyl, etc.

Preferred examples of Q⁵ used include benzyl, 2-chlorobenzyl, 3-chlorobenzyl, 4-chlorobenzyl, 4-aminobenzyl, 2-pyridylmethyl, 3-pyridylmethyl, 4-pyridylmethyl, 1-naphthylmethyl, 2-naphthylmethyl, 3-indolemethyl, 1-formylindol-3-ylmethyl, 2-quinolylmethyl, cyclohexylmethyl, hydroxymethyl, 1-hydroxyethyl, methyl, isopropyl, isobutyl, sec-butyl, carboxymethyl, 4-aminobutyl, etc., particularly preferably, benzyl, 2-chlorobenzyl, 3-chlorobenzyl, 4-chlorobenzyl, 4-aminobenzyl, 2-pyridylmethyl, 3-pyridylmethyl, 4-pyridylmethyl, 1-naphthylmethyl, 2-naphthylmethyl, 3-indolemethyl, 2-quinolylmethyl, cyclohexylmethyl, 1-hydroxyethyl, isopropyl, isobutyl, sec-butyl, etc.

Preferred examples of Q⁶ used are methyl, hydroxymethyl, 1-hydroxyethyl, carbamoylmethyl, 2-carbamoylethyl, etc., particularly preferably, carbamoylmethyl, etc.

Preferred examples of Q⁷ used are 4-hydroxybenzyl, carbamoylmethyl, 3-pyridylmethyl, methyl, isobutyl, benzyl, 4-aminobutyl, 3-indolemethyl, etc., particularly preferably, 4-hydroxybenzyl, etc.

Preferred examples of Q⁷ used include benzyl, 2-pyridylmethyl, 3-pyridylmethyl, 4-pyridylmethyl, 2-naphthylmethyl, 3-indolemethyl, hydroxymethyl, cyclohexylmethyl, sec-butyl, 1-hydroxyethyl, methyl, methyl, isobutyl, 4-aminobutyl, 2-carboxyethyl, 3-carboxylpropyl, etc., more preferably, 4-pyridylmethyl, 3-indolemethyl, 2-carboxyethyl, sec-butyl, and particularly preferably, 2-carboxyethyl.

Preferred examples of Q⁹ used include hydrogen atom, methyl, ethyl, hydroxymethyl, 1-hydroxyethyl, carbamoylmethyl, 2-carbamoylethyl, ureidomethyl, acetamidomethyl, diethyl, methylcarbamoylmethyl, dimethylcarbamoylmethyl, etc., particularly preferably, carbamoylmethyl, ureidomethyl, etc.

Preferred examples of Q¹⁰ used include 4-hydroxybenzyl, 3-indolemethyl, methyl, 1-hydroxyethyl, 3-guanidinopropyl, etc., particularly preferably, 3-indolemethyl, etc.

Preferred examples of Q¹¹ used include carbamoylmethyl, etc.

Preferred examples of Q¹² used include methyl, carbamoylmethyl, etc., particularly preferably, carbamoylmethyl, etc.

Each of Y¹ through Y³ represents a group shown by formula: -CON(J¹³)-, -CSN(J¹³)-, -C(J¹⁴)N(J¹³)- or -N(J¹³)CO- (wherein each of J¹³ and J¹⁴ represents hydrogen atom or a C₁₋₃ alkyl group).

As the C₁₋₃ alkyl group shown by J¹³ and J¹⁴, methyl, ethyl, propyl or isopropyl is used.

J¹³ is preferably hydrogen atom.

J¹⁴ is preferably hydrogen atom.

Y¹ is preferably a group shown by formula: -CONH- or -CH₂NH-, etc.

Y² is preferably a group shown by formula: -CONH- or -CH₂NH-, etc., particularly preferably a group shown by formula: -COCN-.

Y³ is preferably a group shown by formula: -CONH-, etc.

J³ and Q³, J⁴ and Q⁴, J⁵ and Q⁵, J⁶ and Q⁶, J⁷ and Q⁷, J⁸ and Q⁸, J⁹ and Q⁹, J¹⁰ and Q¹⁰, J¹¹ and Q¹¹, and J¹² and Q¹² may be combined together to form a ring. In this case, C(J³)(Q³), C(J⁴)(Q⁴), C(J⁵)(Q⁵), C(J⁶)(Q⁶), C(J⁷)(Q⁷), C(J⁸)(Q⁸), C(J⁹)(Q⁹), C(J¹⁰)(Q¹⁰), C(J¹¹)(Q¹¹) or C(J¹²)(Q¹²) may form, for example, cyclopentane, cyclohexane, piperidine, etc.

Z¹ and R¹, J² and Q³, Y¹ and Q⁴, Y² and Q⁵, Y³ and Q⁶, J² and Q⁷, Y² and Q⁸, Y³ and Q⁹, J² and Q¹⁰, Y³ and Q¹¹, and J² and Q¹² (preferably, J² and Q³, Y¹ and Q⁴, Y² and Q⁵, Y³ and Q⁶, J² and Q⁷, Y² and Q⁸, Y³ and Q⁹, J² and Q¹⁰, Y³ and Q¹¹, and J² and Q¹²) may be combined together to form a ring. Also, the ring formed may be substituted or form a fused ring.

When Z¹ and R¹, J² and Q³, J² and Q⁷, J² and Q¹⁰, or J² and Q¹² forms a ring, the ring is shown by Z¹-N-CH-R¹, J²-C(J³)(Q³), J²-C(J⁷)(Q⁷), J²-C(J¹⁰)(Q¹⁰) J²-C(J¹²)(Q¹² including, e.g., azetidine, pyrrolidine, piperidine or thiazolidine. Also, the ring formed may be substituted or may form a fused ring. As Z¹—N-CH-R¹, azetidine, pyrrolidine, 4-hydroxypyrrolidine, piperidine, etc. are preferably used.

When Y¹ and Q⁴, Y² and Q⁵, Y³ and Q⁶, Y² and Q⁸, Y³ and Q⁹, or Y³ and Q¹¹ forms a ring, the ring is shown by Y¹C(J⁴)(Q⁴), Y²C(J⁵)(Q⁵), Y³C(J⁶)(Q⁶), Y²C(J⁸)(Q⁸), Y³C(J⁹)(Q⁹) or Y³C(J¹¹)(Q¹¹) including, e.g., pyrrolidine-2-carbonyl, piperidine-2-carbonyl or thiazolidine-4-carbonyl. Also, the ring formed may be substituted or may form a fused ring.

When Y² and Q are combined together to form a ring, it is preferred to form pyrrolidine-2-carbonyl by Y²C(J⁸)(Q⁸).

Z¹⁰ represents hydrogen atom, O or S; O and S are preferred among others, and O is particularly preferred.

Preferred examples of the group represented by formula: J¹-J²-C(J³)(Q³)Y¹C(J⁴)(Q⁴)Y²C(J⁵)(Q⁵)Y³C(J⁶)(Q⁶)C(═Z¹⁰)— include:

-   Tyr Asn Trp Asn-, (SEQ ID NO:68) -   Tyr Asn Trp D-Asn-, -   Tyr Asn D-Trp Asn-, -   Tyr D-Asn Trp Asn-, -   D-Tyr Asn Trp Asn-, -   Tyr Lys Trp Asn-, (SEQ ID NO:69) -   Tyr Asp Trp Asn-, (SEQ ID NO:70) -   Tyr Tyr Trp Asn-, (SEQ ID NO:71) -   Tyr Leu Trp Asn-, (SEQ ID NO:72) -   Tyr Asn Ala Asn-, (SEQ ID NO:73) -   Tyr Asn Leu Asn-, (SEQ ID NO:74) -   Tyr Asn Ser Asn-, (SEQ ID NO:75) -   Tyr Asn Asp Asn-, (SEQ ID NO:76) -   Tyr Asn Lys Asn-, (SEQ ID NO:77) -   Ala Asn Trp Asn-, (SEQ ID NO:78) -   Leu Asn Trp Asn-, (SEQ ID NO:79) -   Ser Asn Trp Asn-, (SEQ ID NO:80) -   Asp Asn Trp Asn-, (SEQ ID NO:81) -   Lys Asn Trp Asn-, (SEQ ID NO:82) -   Tyr Asn Trp(For) Asn-, -   D-Tyr Asn D-Trp Asn-, -   D-Tyr Asn Ala Asn-, -   D-Tyr Asn Ser Asn-, -   D-Tyr Asn Cha Asn-, -   D-Tyr Asn Thr Asn-, -   D-Tyr Asn Ile Asn-, -   D-Tyr Gln Trp Asn-, -   D-Tyr Thr Trp Asn-, -   D-Tyr Asn Val Asn-, -   D-Tyr D-Asn Trp Asn-, -   D-Tyr D-Asn D-Trp Asn-, -   D-Tyr Asn Phe Asn-, -   D-Tyr Asn Nal(1) Asn-, -   D-Tyr Asn Nal(2) Asn-, -   D-Tyr Asn Phe(2CI) Asn-, -   D-Tyr Asn Phe(3CI) Asn-, -   D-Tyr Asn Phe(4CI) Asn-, -   D-Tyr Asn Phe(4NH.sub.2) Asn-, -   D-Tyr Asn Pya(3) Asn-, -   D-Tyr D-Asn Phe Asn-, -   D-Tyr D-Asn Cha Asn-, -   D-Tyr D-Asn Thr Asn-, -   D-Tyr Asn Pya(2) Asn-, -   D-Tyr Asn Pya(4) Asn-, -   D-Tyr D-Ser Trp Asn-, -   D-Tyr D-His Trp Asn-, -   D-Pya(3) D-Asn Cha Asn-, -   D-Pya(3) D-Tyr Cha Asn-, -   Tyrψ(CH.sub.2NH)Asn Trp Asn-, -   D-Tyr Asnψ(CH.sub.2NH)Trp Asn-, -   Tyrψ(CH.sub.2NH)Asn D-Trp Asn-, -   D-Tyr Asn AIa(2-Qui) Asn-, -   D-Tyr Asn D-Pya(4) Asn-, -   D-Tyr D-Asn Pya(4) Asn-, -   Tyr D-Asn Cha Asn-, -   Dap D-Tyr Asn Trp Asn- -   Arg D-Tyr D-Pya(4) Asn- -   Arg Arg D-Tyr D-Pya(4) Asn- -   Arg Acp D-Tyr D-Pya(4) Asn- -   D-Arg Acp D-Tyr D-Trp Asn- -   D-Arg D-Arg Acp D-Tyr D-Trp Asn- -   Ac D-Arg Acp D-Tyr D-Trp Asn- -   D-Dap Acp D-Tyr D-Trp Asn- -   D-NIe Acp D-Tyr D-Trp Asn- -   D-Arg β-Ala D-Tyr D-Trp Asn- -   D-Arg γ-Abu D-Tyr D-Trp Asn- -   D-Arg D-Arg γ-Abu D-Tyr D-Trp Asn- -   D-Arg D-Arg D-Arg .γ-Abu D-Tyr D-Trp Asn- -   Gly D-Tyr D-Trp Asn- -   Ac Gly D-Tyr D-Trp Asn- -   D-Tyr D-Tyr D-Trp Asn- -   Ac D-Tyr D-Tyr D-Trp Asn- -   pGlu D-Tyr D-Trp Asn- -   Tyr D-Tyr D-Trp Asn- -   Ac Tyr D-Tyr D-Trp Asn- and the like.

Preferred examples of the group represented by formula: J¹-J²-C(J⁷)(Q⁷)Y²C(J⁸)(Q⁸)Y³C(J⁹)(Q⁹)C(═Z¹⁰)— Include:

-   Fmoc Asn Trp Asn-, -   D-Asn Trp Asn-, -   D-Tyr Trp Asn-, -   D-Tyr D-Trp Asn-, -   D-Tyr Ser Asn-, -   D-Tyr Thr Asn-, -   D-Tyr Ile Asn-, -   D-Tyr Phe Asn-, -   D-Tyr Nal(2) Asn-, -   D-Pya(3) Phe Asn-, -   D-Pya(3) Trp Asn-, -   D-Tyr D-Pya(4) Asn-, -   D-Asn Cha Asn- -   D-Tyr D-Pya(4) Ala- -   D-Tyr D-Pya(4) Thr- -   D-Tyr Pya(4) Ala- -   D-Tyr D-Trp Ala- -   D-Tyr D-Trp Abu- -   D-Tyr D-Phe Ala-6-Aminocaproyl- -   D-Tyr D-Pya(4) Asn- -   Ac D-Tyr D-Pya(4) Asn- -   Benzoyl D-Tyr D-Trp Asn- -   Cyclopropanecarbonyl D-Tyr D-Trp Asn- -   Butyryl D-Tyr D-Trp Asn- -   Me D-Tyr D-Trp Asn- -   Ac D-Tyr D-Trp Gln- -   Ac D-Tyr D-Trp Ser- -   Ac D-Tyr D-Trp Thr- -   Ac D-Tyr D-Trp Alb- -   Ac D-Tyr D-Trp Dap(Ac)- -   Ac D-Tyr D-Trp Dap(For)- -   Ac D-Tyr Trp Asn- -   Ac D-NMeTyr D-Trp Asn- -   For D-Tyr D-Trp Asn- -   Propionyl D-Tyr D-Trp Asn- -   Amidino D-Tyr D-Trp Asn- -   Ac D-Ala D-Trp Asn- -   Ac D-Leu D-Trp Asn- -   Ac D-Phe D-Trp Asn- -   Ac D-Nal(1) D-Trp Asn- -   Ac D-Nal(2) D-Trp Asn- -   Ac D-Lys D-Trp Asn- -   Ac D-Glu D-Trp Asn- -   Ac D-Tyr D-Ala Asn- -   Ac D-Tyr D-Leu Asn- -   Ac D-Tyr D-Phe Asn- -   Ac D-Tyr D-Thr Asn- -   Ac D-Tyr D-Lys Asn- -   Ac D-Tyr D-Glu Asn- -   Ac D-Tyr D-Trp Asp- -   Ac D-Tyr D-Trp D-Asn- -   Ac D-Tyr D-Trp NMeAsn- -   Ac D-Tyr Pro Asn- -   Ac D-Tyr D-Pya(2) Asn- -   Ac D-Tyr D-Pya(3) Asn- -   Ac D-Tyr D-Pro Asn- -   Ac D-Tyr Tic Asn- -   Ac Tyr Trp Asn- -   Ac D-Tyr NMMeTrp Asn- -   Glycoloyl D-Tyr D-Trp Asn- -   Ac D-Tyr D-Trp Gly- -   Ac D-Tyr D-Trp Dap- -   Ac D-Tyr D-Trp Asp(NHMe)- -   Ac D-Tyr D-Trp Asp(NMe₂)- -   Ac-D-Tyr-D-Trp-Asp(NHPen)- -   Ac-D-Tyr-D-Trp-Asp(NHcPr)- -   Ac-D-Tyr-D-Trp-Asp(NHBzl)- -   Ac-D-Tyr-D-Trp-Alb- -   Ac-D-Tyr-D-Pya(4)-Alb- -   Ac-D-Tyr-Aze(2)-Asn- -   Ac-D-Tyr-Pic(2)-Asn- -   Ac-D-Tyr-Hyp-Asn- -   Ac-D-Tyr-Thz-Asn- -   Ac-D-Tyr-Gly-Asn- -   Ac-D-Tyr-Aib-Asn- -   Ac-D-Tyr-D-NMeAla-Asn- -   Ac-D-Tyr-D-Gln-Asn- -   Ac-D-Tyr-D-His-Asn- -   Ac-D-Tyr-D-Trp-Dab- -   Ac-D-Tyr-Ala-Asn- -   Ac-D-Tyr-Leu-Asn- -   Ac-D-Tyr-Ser-Asn- -   Ac-D-Tyr-Lys-Asn- -   Ac-D-Tyr-Glu-Asn- -   Ac-D-Tyr-Pzc(2)-Asn- -   Ac-D-Tyr-Orn-Asn- -   Ac-D-Tyr-Thr-Asn- -   Ac-D-Tyr-His(3Me)-Asn- -   Ac-D-Tyr-Tyr(PO₃H₂)-Asn- -   Glycoloyl-D-Tyr-Hyp-Asn- -   Ac-D-Tyr-Pro(4NH₂)-Asn- -   Ac-D-Tyr-Hyp(Bzl)-Asn- -   Ac-D-Tyr-D-NMePhe-Asn- -   Ac-D-Tyr-Hyp-Alb- -   Ac-D-Tyr-Hyp-His- -   Ac-D-Tyr-Hyp-Gln- -   Ac-D-Tyr-Hyp-D-Asn- -   Ac-D-Tyr-Hyp-Cit- -   Ac-D-Tyr-Glu-Alb- -   Ac-D-Tyr-Aad-Asn- -   Ac-D-Tyr-Pro(4F)-Asn-     and the like; the following groups are particularly preferred. -   Ac D-Tyr Hyp Asn- -   Ac D-Tyr Glu Asn- -   Ac-D-Tyr-Hyp-Alb- -   Ac-D-Tyr-Glu-Alb- -   Ac-D-Tyr-Pro(4F)-Asn-

Preferred examples of the group represented by formula: J¹-J²-C(J¹⁰)(Q¹⁰)Y³C(J¹¹)(Q¹¹)C(═Z¹⁰)— include:

-   Fmoc Trp Asn-, -   Boc Tyr Asn-, -   Tyr Asn-, -   D-Trp Asn-, -   Ac Trp Asn-, -   Amidino Trp Asn-, -   Ac Ala Asn-, -   Ac Arg Asn-, -   Ac Thr Asn- -   D-Tyr D-Pya(4)- -   3-(4-Hydroxyphenyl)propionyl D-Trp Asn- -   D-Trp Asn- -   Ac D-Trp Asn- -   Hexanoyl D-Trp Asn- -   Cyclohexanecarbonyl D-Trp Asn- -   Benzoyl D-Trp Asn- -   3-Pyridinepropionyl D-Trp Asn- -   Adipoyl D-Trp Asn- -   6-Aminocaproyl D-Trp Asn- -   Amidino D-Trp Asn- -   Glycoloyl D-Trp Asn-     and the like.

Preferred examples of the group represented by formula: J¹-J²-C(J¹²)(Q¹²)C(═Z¹⁰)— include:

-   Fmoc Asn-, -   3-(Indol-3-yl)propionyl Asn-, -   3-Indolecarbonyl Asn-, -   3-Indoleacetyl Asn-, -   4-(Indol-3-yl)butyryl Asn-, -   Diphenylacetyl Asn-, -   Hexanoyl Asn-, -   Cyclohexanecabonyl Asn-, -   2-(Indol-3-yl)ethylcabamoyl Asn-, -   3-(3-Pyridyl)propionyl Asn-, -   4-Imidzoleacetyl Asn-, -   Piperidinecarbonyl Asn-, -   1-Piperidineacetyl Asn-, -   1-Methyl-1-piperidinioacetyl Asn-, -   1-Pyridinioacetyl Asn-, -   D-Glucronyl Asn- -   3-Phenylpropionyl Asn- -   3-Phenylpropionyl Ala- -   Benzoyl Asn- -   Ac Asn- -   Cyclopropanecarbonyl Asn- -   2-Naphthoyl Asn-     and the like.

Preferred examples of the group represented by formula: J¹⁻ include:

-   hydrogen atom -   GuAmb- -   3-(3-Indolyl)propionyl- -   3-(3-Pyridyl)propionyl- -   Benzoyl- -   Indole-3-carbonyl- -   Indole-3-acetyl- -   Ac- -   Hexanoyl- -   Z- -   Tos- -   3-Phenylpropionyl- -   2-(Indol-3-yl)ethylcarbamoyl- -   Benzyl- -   Phenethyl- -   2-Pyridinecarbonyl- -   4-Pyridinecarbonyl- -   Propionyl- -   Isobutyryl- -   Cyclohexanecarbonyl- -   Phenylacetyl- -   2-Methylnicotinoyl- -   5-Methylnicotinoyl- -   6-Methylnicotinoyl- -   Pyrazinecarbonyl- -   Cyclopropanecarbonyl- -   Trifluoroacetyl- -   (R)-3-hydroxy-2-methylpropionyl -   2-Hydroxyisobutyryl- -   3-Furancarbonyl- -   Pyrrole-2-carbonyl- -   4-Imidazolecarbonyl- -   6-Hydroxynicotinoyl- -   6-Chloronicotinoyl- -   6-(Trifluoromethyl)nicotinoyl- -   Dimethylcarbamoyl- -   1-Azetidinecarbonyl- -   2-Azetidinecarbonyl- -   4-Aminobenzoyl- -   4-Aminomethylbenzoyl- -   Pyrrole-3-carbonyl- -   Pyrimidine-4-carbonyl- -   Pyrimidine-2-carbonyl- -   Pyridazine-4-carbonyl- -   4-[Bis-(2-Pyridylmethyl)aminomethyl]benzoyl-     and the like.

In the present invention, preferred P is Ac-D-Tyr-Hyp-Asn, Ac-D-Tyr-Glu-Asn or Ac-D-Tyr-Hyp-Alb-.

The metastin derivatives of the present invention or salts thereof are preferably compounds represented by formula I described above, or salts thereof, wherein:

Z¹, Z⁵ and Z⁷ each represents hydrogen atom;

Z², Z⁴, Z⁶ and Z⁸ each represents O;

R¹ represents (2) a C₁₋₈ alkyl group optionally substituted with an optionally substituted hydroxyl group;

R² represents a linear C₁₋₁₀ alkyl group or a C₁₋₁₀ alkyl group consisting of a cyclic alkyl group and a linear alkyl group;

R³ represents (1) a C₁₋₈ alkyl group having an optionally substituted basic group and optionally having an additional substituent;

R⁴ represents (4) a C₁₋₄ alkyl group, which may optionally be substituted with an optionally substituted 5- to 14-membered aromatic fused heterocyclic group consisting of 3 to 11 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms;

Q¹ represents a C₁₋₄ alkyl group, which may optionally be substituted with a substituent selected from the group consisting of (1) an optionally substituted C₆₋₁₂ aromatic hydrocarbon group, (2) an optionally substituted 5- to 14-membered aromatic heterocyclic group consisting of 1 to 7 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms, and (5) an optionally substituted non-aromatic cyclic hydrocarbon group having carbon atoms not greater than 7;

A represents (1) a nitrogen atom substituted with hydrogen atom, (2) a carbon atom substituted with hydrogen atom;

A′ represents (1) a carbon atom substituted with hydrogen atom or O;

Q² represents (1) an optionally substituted CH₂ or CH═CH₂ with one or two C₁₋₄ alkyl groups which may optionally be substituted with a substituent selected from the group consisting of carbamoyl group, hydroxyl group, a C₁₋₃ alkoxy group and an amino group;

Y represents (1) a group represented by formula: -CONH-, -CSNH-, -NHCO-, -CH₂O-, -CH₂S-, -COCH₂-, -CH═CH- or -CH₂CH₂-, which may optionally be substituted with a substituent selected from the group consisting of a C₁₋₆ alkyl group, hydroxyl group or a halogen atom.

More preferably, the metastin derivatives of the present invention or salts thereof are compounds represented by the formula below, or salts thereof: XX0-XX2-XX3-XX4-XX5-T-XX9-XX10-NH₂ wherein:

XX0 represents formyl, C₁₋₂₀ alkanoyl, cyclopropanecarbonyl, 6-(acetyl-D-arginylamino)caproyl, 6-((R)-2,3-diaminopropionylamino)caproyl, 6-(D-norleucylamino)caproyl, 4-(D-arginylamino)butyryl, 3-(4-hydroxyphenyl)propionyl, glycyl, tyrosyl, acetylglycyl, acetyltyrosyl, D-tyrosyl, acetyl-D-tyrosyl, pyroglutamyl, 3-(pyridin-3-yl)propionyl, adipoyl, glycoloyl or 6-aminocaproyl;

XX2 represents Tyr, D-Tyr, D-Ala, D-Leu, D-Phe, D-Lys, D-Trp or a chemical bond;

XX3 represents D-Asp, D-Dap, D-Ser, D-Gln, D-His, D-NMeAla, D-NMePhe, Aze(2), Pic(2), Pic(3), Hyp, Thz, NMeAla, Gly, Aib, Abz(2), Abz(3), Sar, Leu, Lys, Glu, β-alanine, Pzc(2), Orn, His(3Me), Tyr(PO₃H₂), Pro(4NH₂), Hyp(Bzl), Trp, Pro, 4-pyridylalanine, Tic, D-Trp, D-Ala, D-Leu, D-Phe, D-Lys, D-Glu, D-2-pyridylalanine, D-3-pyridylalanine, D-4-pyridylalanine, Aad, Pro(4F) or a chemical bond;

XX4 represents Asn, 2-amino-3-ureidopropionic acid, N^(β)-formyldiaminopropionic acid, N^(β)-acetyldiaminopropionic acid, N^(ω)-pentylasparagine, N^(ω)-cyclopropylasparagine, N^(ω)-benzylasparagine, 2,4-diaminobutanoic acid, His, Gln, Cit or D-Asn;

XX5 represents Ser, Thr, Val, NMeSer, Gly, Ala, Hyp, D-Ala, Dap or D-Thr (more preferably, Ser, Thr, Val, NMeSer, Gly, Ala, Hyp, D-Ala or D-Thr);

T represents a group represented by formula II:

wherein:

Z⁴ represents hydrogen atom, O or S;

R² represents (1) hydrogen atom, (2) a cyclic or linear C₁₋₁₀ alkyl group, (3) a C₁₋₁₀ alkyl group consisting of a cyclic alkyl group and a linear alkyl group, or (4) a C₁₋₈ alkyl group optionally substituted with a substituent selected from the group consisting of an optionally substituted carbamoyl group, an optionally substituted hydroxyl group and an optionally substituted aromatic cyclic group;

Q¹ represents a C₁₋₄ alkyl group, which may optionally be substituted with a substituent selected from the group consisting of (1) an optionally substituted C₆₋₁₂ aromatic hydrocarbon group, (2) an optionally substituted 5- to 14-membered aromatic heterocyclic group consisting of 1 to 7 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms, (3) an optionally substituted C₈₋₁₄ aromatic fused-ring group, (4) an optionally substituted 5- to 14-membered aromatic fused heterocyclic group consisting of 3 to 11 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms, (5) an optionally substituted non-aromatic cyclic hydrocarbon group having carbon atoms not greater than 7, and (6) an optionally substituted non-aromatic heterocyclic group having carbon atoms not greater than 7;

A represents:

-   (1) a nitrogen atom substituted with hydrogen atom or a C₁₋₃ alkyl     group; -   (2) a carbon atom substituted with hydrogen atom or a C₁₋₃ alkyl     group; -   (3) O; or -   (4) S;

A′ represents:

-   (1) a carbon atom, which may optionally be substituted with hydrogen     atom, O, S, a halogen atom, an optionally halogenated C₁₋₃ alkyl     group, carbamoyl group or hydroxyl group; -   (2) a nitrogen atom, which may optionally be substituted with     hydrogen atom or an optionally halogenated C₁₋₃ alkyl group; -   (3) O; or -   (4) S;

Q² represents:

-   (1) CH₂ or CH═CH₂, which may optionally be substituted with a C₀₋₄     alkyl group optionally substituted with a substituent selected from     the group consisting of carbamoyl group, hydroxyl group, a C₁₋₃     alkoxy group and an amino group; -   (2) NH, which may optionally be substituted with an optionally     substituted C₁₋₄ alkyl group with a substituent selected from the     group consisting of carbamoyl group and hydroxyl group; or, -   (3) O;

Y represents:

-   (1) a group represented by formula: -CONH-, -CSNH-, -CH₂NH-, -NHCO-,     -CH₂O-, -COCH₂-, -CH₂S-, -CSCH₂-, -CH₂SO-, -CH₂SO₂-, -COO-, -CSO-,     -CH₂CH₂- or -CH═CH-, which may optionally be substituted with a     substituent selected from the group consisting of a C₁₋₆ alkyl     group, hydroxyl group and a halogen atom; -   (2) an optionally substituted C₆₋₇ aromatic hydrocarbon group; -   (3) an optionally substituted 4- to 7-membered aromatic heterocyclic     group consisting of 1 to 5 carbon atoms and hetero atoms selected     from the group consisting of nitrogen, oxygen and sulfur atoms; -   (4) an optionally substituted non-aromatic cyclic hydrocarbon group     having carbon atoms not greater than 5; or -   (5) an optionally substituted non-aromatic heterocyclic group having     carbon atoms not greater than 5 and when Y is (2), (3), (4) or (5),     Q² may be a chemical bond;

the bonds between Y-Q², Q²-A′ and A′-A each independently represents a single or double bond;

XX9 represents Arg, Orn, Arg(Me) or Arg(asymMe₂); and,

XX10 represents Phe, Trp, 2-naphthylalanine, 2-thienylalanine, tyrosine or 4-fluorophenylalanine; provided that Ac-D-Tyr-D-Trp-Asn-Thr-PheΨ(CH₂NH)Gly-Leu-Arg(Me)-Trp-NH₂, Ac-D-Tyr-D-Trp-Asn-Thr-Phe-Gly-Leu-Arg(Me)-Trp-NH₂, Ac-D-Tyr-D-Trp-Asn-Thr-D-Phe-Gly-Leu-Arg(Me)-Trp-NH₂, and, Ac-D-Tyr-D-Trp-Asn-Thr-Phe-Gly-Aib-Arg(Me)-Trp-NH₂ are excluded from these compounds.

More preferably, the metastin derivatives of the present invention or salts thereof are compounds represented by the following formula, or salts thereof: XX0-XX2-XX3-XX4-XX5-T-XX9-XX10-NH₂ wherein:

XX0 represents formyl, C₁₋₆ alkanoyl or glycoloyl;

XX2 represents D-Tyr or a chemical bond;

XX3 represents Aze(2), Hyp, Gly, Aib, Leu, Lys, Glu, His(3Me), Tyr(PO₃H₂), Pro(4F) or Hyp(Bzl);

XX4 represents Asn or 2-amino-3-ureidopropinonic acid;

XX5 represents Ser or Thr;

T represents the group represented by formula II described above;

Z⁴ represents O;

R² represents a linear C₁₋₁₀ alkyl group or a C₁₋₁₀ alkyl group consisting of a cyclic alkyl group and a linear alkyl group;

Q¹ represents a C₁₋₄ alkyl group, which may optionally be substituted with a substituent selected from the group consisting of (1) an optionally substituted C₆₋₁₂ aromatic hydrocarbon group, (2) an optionally substituted 5- to 14-membered aromatic heterocyclic group consisting of 1 to 7 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms, and (5) an optionally substituted non-aromatic cyclic hydrocarbon group having carbon atoms not greater than 7;

A represents (1) a nitrogen atom substituted with hydrogen atom, (2) a carbon atom substituted with hydrogen atom;

A′ represents (1) a carbon atom substituted with hydrogen atom or O,

Q² represents (1) an optionally substituted CH₂ or CH═CH₂ with one or two C₀₋₄ alkyl groups which may optionally be substituted with a substituent selected from the group consisting of carbamoyl group, hydroxyl group, a C₁₋₃ alkoxy group and an amino group;

Y represents (1) a group represented by formula: -CONH-, -CH₂O-, -CH₂S-, -COCH₂-, -CH₂CH₂-, CSNH-, -NHCO- or -CH═CH-, which may optionally be substituted with a substituent selected from the group consisting of a C₁₋₆ alkyl group, hydroxyl group and a halogen atom;

XX9 represents Arg or Arg(Me); and,

XX10 represents Phe or Trp.

The metastin derivatives of the present invention or salts thereof, which are particularly preferred, are compounds represented by the following formula, or salts thereof: XX0-XX2-XX3-XX4-XX5-T-XX9-XX10-NH₂ wherein:

XX0 represents C₁₋₂ alkanoyl;

XX2 represents D-Tyr;

XX3 represents Hyp, Pro(4F) or Glu;

XX4 represents Asn, 2-amino-3-ureidopropionic acid;

XX5 represents Thr;

T represents the group represented by formula II described above;

Z⁴ represents O;

R² represents a linear C₁₋₁₀ alkyl group or a C₁₋₁₀ alkyl group consisting of a cyclic alkyl group and a linear alkyl group;

Q¹ represents a C₁₋₄ alkyl group, which may optionally be substituted with a substituent selected from the group consisting of (1) an optionally substituted C₆₋₁₂ aromatic hydrocarbon group, (2) an optionally substituted 5- to 14-membered aromatic heterocyclic group consisting of 1 to 7 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms, and, (5) an optionally substituted non-aromatic cyclic hydrocarbon group having carbon atoms not greater than 7;

A represents (1) a nitrogen atom substituted with hydrogen atom, (2) a carbon atom substituted with hydrogen atom;

A′ represents (1) a carbon atom substituted with hydrogen atom or O;

Q² represents (1) an optionally substituted CH₂ or CH═CH₂ with one or two C₁₋₄ alkyl groups which may optionally be substituted with a substituent selected from the group consisting of carbamoyl group, hydroxyl group, a C₁₋₃ alkoxy group and an amino group;

Y represents (1) a group represented by formula: -CONH-, -CSNH-, -NHCO-, -CH₂O-, -CH₂S-, -COCH₂-, -CH═CH- or -CH₂CH₂-, which may optionally be substituted with a C₁₋₆ alkyl group, hydroxyl group or a halogen atom;

XX9 represents Arg or Arg(Me); and,

XX10 represents Trp.

In the present invention, Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Phe-NH₂ (SEQ ID NO: 16) is referred to as metastin 10 (Metastin10), i.e., MS10.

In EXAMPLES later described, the N-terminal Tyr and the C-terminal Phe in MS10 are counted as 1- and 10-positions, respectively.

(SEQ ID NO: 16) Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Phe-NH₂ 1   2   3   4   5   6   7   8   9   10

For example, Compound No. 796 (EXAMPLE 1): des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Arg(Me)9,Trp10]MS10 means a peptide wherein the N-terminal Tyr (1-position) is deleted, Asn at the 2-position is replaced by D-Tyr, Trp at the 3-position is replaced by Hyp, Ser at the 5-position is replaced by Thr, Arg at the 9-position is replaced by Arg(Me), the C-terminal (10-position) is replaced by Trp, and the amino group on the D-Tyr at the 2-position is modified to Ac.

The chemical bonds “-” between XX0, XX2, XX3, XX4, XX5, T, XX9, XX10 and NH₂ in the formula “XX0-XX2-XX3-XX4-XX5-T-XX9-XX10-NH₂” have the following significance, respectively.

The chemical bond “-” in the formula “XX0-XX1” means the bond between the group represented by XX0 and the amino group α-amino group) contained in XX2. More specifically, “XX0-XX1” indicates that the hydrogen atom in the amino group (NH₂) contained in XX2 is substituted with a group represented by XX0.

The chemical bond “-” in the formula “XX2-XX3” means that the carboxyl group (α-carboxyl group) contained in XX2 is bound to the amino group (α-amino group) in XX3 via an amide bond. Also, the chemical bonds “-” in the formulae “XX3-XX4,” “XX4-XX5” and “XX9-XX10” have the same significance as described above.

The chemical bond “-” in the formula “XX5-T” represents the bond between the carboxyl group (α-carboxyl group) in XX5 and a group represented by the group represented by T. More specifically, -OH in the carboxyl group (-COOH) contained in XX5 is substituted with the group represented by T.

The chemical bond “-” in the formula “T-XX9” represents the bond between the group represented by T and the amino group (α-amino group) in XX9. More specifically, hydrogen atom in the amino group (NH₂) contained in XX9 is substituted with the group represented by T.

The chemical bond “-” in the formula “XX10-NH₂” represents the bond between the carboxyl group (α-carboxyl group) contained in XX10 and -NH₂. More specifically, -OH in the carboxyl group (-COOH) contained in XX10 is substituted with -NH₂.

Where XX2 or/and XX3 represent the chemical bonds “-,” these chemical bonds “-” have the same significance as described above.

Specific examples of these chemical bonds include the bonds represented by the structural formulae shown in TABLE 1 later described, and so on.

In the metastin derivatives of the present invention, all compounds that the groups described above are optionally combined are preferably used. Among others, the following compounds are preferred.

(SEQ ID NO: 16) MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Phe-NH₂      1   2   3   4   5   6   7   8   9   10 (Compound No. 796) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Arg(Me)9,Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-Phe-GIy-Leu-Arg(Me)-Trp-NH₂ (Compound No. 803) des(1)-Ac-[D-Tyr2,Hyp3,ThrS,Ala7,Arg(Me)9,Trp10] MS10 Ac-D-Tyr-Hyp-Asn-Thr-Phe-Ala-Leu-Arg(Me)-Trp-NH₂ (Compound No. 804) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Ser7,Arg(Me)9,Trp10] MS10 Ac-D-Tyr-Hyp-Asn-Thr-Phe-Ser-Leu-Arg(Me)-Trp-NH₂ (Compound No. 811) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Aib7,Arg(Me)9,Trp10] MS10 Ac-D-Tyr-Hyp-Asn-Thr-Phe-Aib-Leu-Arg(Me)-Trp-NH₂ (Compound No. 818) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Abu7,Arg(Me)9,Trp10] MS10 Ac-D-Tyr-Hyp-Asn-Thr-Phe-Abu-Leu-Arg(Me)-Trp-NH₂ (Compound No. 822) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Cha6,Arg(Me)9,Trp10] MS10 Ac-D-Tyr-Hyp-Asn-Thr-Cha-Gly-Leu-Arg(Me)-Trp-NH₂ (Compound No. 823) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Cha6,Ala7,Arg(Me)9, Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-Cha-Ala-Leu-Arg(Me)-Trp-NH₂ (Compound No. 827) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Dap7,Arg(Me)9,Trp10] MS10 Ac-D-Tyr-Hyp-Asn-Thr-Phe-Dap-Leu-Arg(Me)-Trp-NH₂ (Compound No. 828) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Ser(Me)7,Arg(Me)9, Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-Phe-Ser(Me)-Leu-Arg(Me)-Trp- NH₂ (Compound No. 834) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Phe6Ψ(CH₂O)Gly7,Arg (Me)9,Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-PheΨ(CH₂O)Gly-Leu-Arg(Me)- Trp-NH₂ (Compound No. 839) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Pya(2)6,Arg(Me)9, Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-Pya(2)-Gly-Leu-Arg(Me)-Trp- NH₂ (Compound No. 847) des(1)-Ac-[D-Tyr2-Hyp3,Thr5,Val7,Arg(Me)9,Trp10] MS10 Ac-D-Tyr-Hyp-Asn-Thr-Phe-Val-Leu-Arg(Me)-Trp-NH₂ (Compound No. 848) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Pya(3)6,Arg(Me)9, Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-Pya(3)-Gly-Leu-Arg(Me)-Trp- NH₂ (Compound No. 849) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Pya(4)6,Arg(Me)9, Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-Pya(4)-Gly-Leu-Arg(Me)-Trp- NH₂ (Compound No. 850) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Phe6Ψ(CH₂CH₂)Gly7,Arg (Me)9,Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-PheΨ(CH₂CH₂)Gly-Leu-Arg(Me)- Trp-NH₂ (Compound No. 851) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Phe6Ψ(COCH₂)Gly7,Arg (Me)9,Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-PheΨ(COCH₂)Gly-Leu-Arg(Me)- Trp-NH₂ (Compound No. 852) des(1)-Ac-[D-Tyr2,Glu3,Thr5,Arg(Me)9,Trp10]MS10 Ac-D-Tyr-Glu-Asn-Thr-Phe-Gly-Leu-Arg(Me)-Trp-NH₂ (Compound No. 853) des(1)-Ac-[D-Tyr2,Glu3,Thr5,Cha6,Arg(Me)9,Trp10] MS10 Ac-D-Tyr-Glu-Asn-Thr-Cha-Gly-Leu-Arg(Me)-Trp-NH₂ (Compound No. 854) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Gly7Ψ(CH₂NH)Leu8,Arg (Me)9,Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-Phe-GlyΨ(CH₂NH)Leu-Arg(Me)- Trp-NH₂ (Compound No. 855) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Ala(cPr)6,Arg(Me)9, Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-Ala(cPr)-Gly-Leu-Arg(Me)-Trp- NH₂ (Compound No. 857) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Phe6Ψ((S)CHOH—CH₂) Gly7,Arg(Me)9,Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-PheΨ((S)CHOH—CH₂)Gly-Leu-Arg (Me)-Trp-NH₂ (Compound No. 858) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Phe6Ψ((S)CHOH—(E)CH═) Gly7,Arg(Me)9,Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-PheΨ((S)CHOH—(E)CH═)Gly-Leu- Arg(Me)-Trp-NH₂ (Compound No. 859) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Phe6P((E)CH═CH)Gly7, Arg(Me)9,Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-PheΨ((E)CH═CH)Gly-Leu-Arg (Me)-Trp-NH₂ (Compound No. 866) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Phe6Ψ((R)CHOH—(E)CH) Gly7,Arg(Me)9,Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-PheΨ((R)CHOH—(E)CH═)Gly-Leu- Arg(Me)-Trp-NH₂ (Compound No. 867) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Phe6Ψ((R)CHOH—CH₂) Gly7,Arg(Me)9,Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-PheΨ((R)CHOH—CH₂)Gly-Leu-Arg (Me)-Trp-NH₂ (Compound No. 869) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,αMePhe6,Arg(Me)9, Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-αMePhe-Gly-Leu-Arg(Me)-Trp- NH₂ (Compound No. 871) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Phe(2Me)6,Arg(Me)9, Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-Phe(2Me)-Gly-Leu-Arg(Me)- Trp-NH₂ (Compound No. 873) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Phe(3Me)6,Arg(Me)9, Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-Phe(3Me)-Gly-Leu-Arg(Me)-Trp- NH₂ (Compound No. 875) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Phe(4Me)6,Arg(Me)9, Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-Phe(4Me)-Gly-Leu-Arg(Me)-Trp- NH₂ (Compound No. 885) des(1)-Ac-[D-Tyr2,Hyp3,Alb4,Thr5,Arg(Me)9,Trp10] MS10 Ac-D-Tyr-Hyp-Alb-Thr-Phe-Gly-Leu-Arg(Me)-Trp-NH₂ (Compound No. 892) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Gly7Ψ((E)CH═CH)Leu8, Arg(Me)9,Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-Phe-GlyΨ((E)CH═CH)Leu-Arg (Me)-Trp-NH₂ (Compound No. 893) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Gly7Ψ(CH₂CH₂)Leu8,Arg (Me)9,Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-Phe-GlyΨ(CH₂CH₂)Leu-Arg(Me)- Trp-NH₂ (Compound No. 894) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Cha6,Ala(cPr)8,Arg(Me) 9,Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-Cha-Gly-Ala(cPr)-Arg(Me)-Trp- NH₂ (Compound No. 895) des(1)-Ac-[D-Tyr2,Glu3,Thr5,Cha6,Ala(cPr)8,Arg(Me) 9,Trp10]MS10 Ac-D-Tyr-Glu-Asn-Thr-Cha-Gly-Ala(cPr)-Arg(Me)-Trp- NH₂ (Compound No. 902) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Cha6,Gly7Ψ((E)CH═CH) Leu8,Arg(Me)9,Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-Cha-GlyΨ((E)CH═CH)Leu-Arg (Me)-Trp-NH₂ (Compound No. 903) des(1)-Ac-[D-Tyr2,Hyp3,Alb4,Thr5,Cha6,Gly7Ψ((E) CH═CH)Leu8,Arg(Me)9,Trp10]MS10 Ac-D-Tyr-Hyp-Alb-Thr-Cha-GlyΨ((E)CH═CH)Leu-Arg (Me)-Trp-NH₂ (Compound No. 904) des(1)-Ac-[D-Tyr2,Glu3,Thr5,Cha6,Gly7Ψ((E)CH═CH) Leu8,Arg(Me)9,Trp10]MS10 Ac-D-Tyr-Gly-Asn-thr-Cha-GlyΨ((E)CH═CH)Leu-Arg (Me)-Trp-NH₂ (Compound No. 905) des(1)-Ac-[D-Tyr2,Glu3,Alb4,Thr5,Cha6,Gly7Ψ((E) CH═CH)Leu8,Arg(Me)9,Trp10]MS10 Ac-D-Tyr-Glu-Alb-Thr-Cha-GlyΨ((E)CH═CH)Leu-Arg (Me)-Trp-NH₂ (Compound No. 906) des(1)-Ac-[D-Tyr2,Hyp3,Alb4,Thr5,Gly7Ψ((E)CH═CH) Leu8,Arg(Me)9,Trp10]MS10 Ac-D-Tyr-Hyp-Alb-Thr-Phe-GlyΨ((E)CH═CH)Leu-Arg (Me)-Trp-NH₂ (Compound No. 907) des(1)-Ac-[D-Tyr2,Glu3,Thr5,Gly7Ψ((E)CH═CH)Leu8, Arg(Me)9,Trp10]MS10 Ac-D-Tyr-Gly-Asn-Thr-Phe-Glyp((E)CH═CH)Leu-Arg (Me)-Trp-NH₂ (Compound No. 908) des(1)-Ac-[D-Tyr2,Glu3,Alb4,Thr5,Gly7Ψ((E)CH═CH) Leu8,Arg(Me)9,Trp10]MS10 Ac-D-Tyr-Glu-Alb-Thr-Phe-GlyΨ((E)CH═CH)Leu-Arg (Me)-Trp-NH₂ (Compound No. 909) des(1)-Ac-[D-Tyr2,Asp3,Thr5,Cha6,Ala(cPr)8,Arg(Me) 9,Trp10]MS10 Ac-D-Tyr-Asp-Asn-Thr-Cha-Gly-Ala(cPr)-Arg(Me)-Trp- NH₂ (Compound No. 910) des(1)-Ac-[D-Tyr2,Aad3,Thr5,Cha6,Ala(cPr)8,Arg(Me) 9,Trp10]MS10 Ac-D-Tyr-Aad-Asn-Thr-Cha-Gly-Ala(cPr)-Arg(Me)-Trp- NH₂ (Compound No. 911) des(1)-Ac-[D-Tyr2,Lys3,Thr5,Cha6,Ala(cPr)8,Arg(Me) 9,Trp10]MS10 Ac-D-Tyr-Lys-Asn-Thr-Cha-Gly-Ala(cPr)-Arg(Me)- Trp-NH₂ (Compound No. 912) des(1)-Ac-[D-Tyr2,Aib3,Thr5,Cha6,Ala(cPr)8,Arg(Me) 9,Trp10]MS10 Ac-D-Tyr-Aib-Asn-Thr-Cha-Gly-Ala(cPr)-Arg(Me)-Trp- NH₂ (Compound No. 913) des(1)-Ac-[D-Tyr2,Hyp3,Gln4,Thr5,Cha6,Gly7Ψ((E) CH═CH)Leu8,Arg(Me)9,Trp10]MS10 Ac-D-Tyr-Hyp-Gln-Thr-Cha-Gly7Ψ((E)CH═CH)Leu-Arg (Me)-Trp-NH₂ (Compound No. 914) des(1)-Ac-[D-Tyr2,Hyp3,Cit4,Thr5,Cha6,Gly7Ψ((E) CH═CH)Leu8,Arg(Me)9,Trp10]MS10 Ac-D-Tyr-Hyp-Cit-Thr-Cha-GlyΨ((E)CH═CH)Leu-Arg (Me)-Trp-NH₂ (Compound No. 915) des(1)-Ac-[D-Tyr2,Hyp3,Glu4,Thr5,Cha6,Gly7Ψ((E) CH═CH)Leu8,Arg(Me)9,Trp10]MS10 Ac-D-Tyr-Hyp-Glu-Thr-Cha-GlyΨ((E)CH═CH)Leu-Arg (Me)-Trp-NH₂ (Compound No. 916) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Ala(cPr)8,Arg(Me)9, Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-Phe-Gly-Ala(cPr)-Arg(Me)-Trp- NH₂ (Compound No. 917) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Ser(Me)8,Arg(Me)9, Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-Phe-Gly-Ser(Me)-Arg(Me)-Trp- NH₂ (Compound No. 918) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Nva8,Arg(Me)9,Trp10] MS10 Ac-D-Tyr-Hyp-Asn-Thr-Phe-Gly-Nva-Arg(Me)-Trp-NH₂ (Compound No. 919) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Nal(2)6,Arg(Me)9, Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-Nal(2)-Gly-Ala(cPr)-Arg(Me)- Trp-NH₂ (Compound No. 920) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Cha6,Ser(Me)8,Arg(Me) 9,Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-Cha-Gly-Ser(Me)-Arg(Me)-Trp- NH₂ (Compound No. 921) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Cha6,Nva8,Arg(Me)9, Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-Cha-Gly-Nva-Arg(Me)-Trp-NH₂ (Compound No. 923) des(1)-Ac-[D-Tyr2,Glu3,Thr5,Cha6,Ser(Me)8,Arg(Me) 9,Trp10]MS10 Ac-D-Tyr-Glu-Asn-Thr-Cha-Gly-Ser(Me)-Arg(Me)-Trp- NH₂ (Compound No. 924) des(1)-Ac-[D-Tyr2,Glu3,Thr5,Cha6,Nva8,Arg(Me)9, Trp10]MS10 Ac-D-Tyr-Glu-Asn-Thr-Cha-Gly-Nva-Arg(Me)-Trp-NH₂ (Compound No. 925) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Gly7Ψ((E)CH═CH)Leu8, Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-Phe-GlyΨ((E)CH═CH)Leu-Arg- Trp-NH₂ (Compound No. 926) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Cha6,Gly7Ψ((E)CH═CH) Leu8,Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-Cha-GlyΨ((E)CH═CH)Leu-Arg- Trp-NH₂ (Compound No. 927) des(1)-Ac-[D-Tyr2,Hyp3,Alb4,Thr5,Cha6,Gly7Ψ((E) CH═CH)Leu8,Trp10]MS10 Ac-D-Tyr-Hyp-Alb-Thr-Cha-GlyΨ((E)CH═CH)Leu-Arg- Trp-NH₂ (Compound No. 929) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Gly7Ψ(CH₂S)Leu8,Arg (Me)9,Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-Phe-GlyΨ(CH₂S)Leu-Arg(Me)- Trp-NH₂ (Compound No. 931) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Cha6,Gly7Ψ(CH₂S)Leu8, Arg(Me)9,Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-Cha-GlyΨ(CH₂S)Leu-Arg(Me)- Trp-NH₂ (Compound No. 932) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Cha6,Nle8,Arg(Me)9, Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-Cha-Gly-Nle-Arg(Me)-Trp-NH₂ (Compound No. 933) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Cha6,Leu(Me)8,Arg(Me) 9,Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-Cha-Gly-Leu(Me)-Arg(Me)-Trp- NH₂ (Compound No. 934) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Cha6,8,Arg(Me)9,Trp10] MS10 Ac-D-Tyr-Hyp-Asn-Thr-Cha-Gly-Cha-Arg(Me)-Trp-NH₂ (Compound No. 940) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Cha6,Ala(cPr)8,Trp10] MS10 Ac-D-Tyr-Hyp-Asn-Thr-Cha-Gly-Ala(cPr)-Arg-Trp-NH₂ (Compound No. 942) des(1)-Ac-[D-Tyr2,Glu3,Thr5,Cha6,Ala(cPr)8,Trp10] MS10 Ac-D-Tyr-Glu-Asn-Thr-Cha-Gly-Ala(cPr)-Arg-Trp-NH₂ (Compound No. 944) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Phe6Ψ(CH₂S)Gly7,Arg (Me)9,Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-PheΨ(CH₂S)Gly-Leu-Arg(Me)- Trp-NH₂ (Compound No. 945) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Ala(cBu)6,Ala(cPr)8, Arg(Me)9,Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-Ala(cBu)-Gly-Ala(cPr)-Arg (Me)-Trp-NH₂ (Compound No. 946) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Cha6,Ala(cBu)8,Arg(Me) 9,Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-Cha-Gly-Ala(cBu)-Arg(Me)-Trp- NH₂ (Compound No. 947) des(1)-Ac-[D-Tyr2,Hyp3,Alb4,Ala5,Cha6,Ala(cPr)8, Arg(Me)9,Trp10]MS10 Ac-D-Tyr-Hyp-Alb-Ala-Cha-Gly-Ala(cPr)-Arg(Me)-Trp- NH₂ (Compound No. 948) des(1)-Ac-[D-Tyr2,Hyp3,Alb4,Ser5,Cha6,Ala(cPr)8, Arg(Me)9,Trp10]MS10 Ac-D-Tyr-Hyp-Alb-Ser-Cha-Gly-Ala(cPr)-Arg(Me)-Trp- NH₂ (Compound No. 949) des(1)-Ac-[D-Tyr2,Hyp3,Alb4,Gly5,Cha6,Ala(cPr)8, Arg(Me)9,Trp10]MS10 Ac-D-Tyr-Hyp-Alb-Gly-Cha-Gly-Ala(cPr)-Arg(Me)-Trp- NH₂ (Compound No. 951) des(1)-Ac-[D-Tyr2,Hyp3,Alb4,Dap5,Cha6,Ala(cPr)8, Arg(Me)9,Trp10]MS10 Ac-D-Tyr-Hyp-Alb-Dap-Cha-Gly-Ala(cPr)-Arg(Me)-Trp- NH₂ (Compound No. 952) des(1)-Ac-[D-Tyr2,Hyp3,Alb4,Thr5,Cha6,Gly7Ψ (CH₂CH₂)Leu8,Trp10]MS10 Ac-D-Tyr-Hyp-Alb-Thr-Cha-GlyΨ(CH₂CH₂)Leu-Arg-Trp- NH₂ (Compound No. 953) des(1)-Ac-[D-Tyr2,Hyp3,Alb4,Thr5,Cha6,Ala(cPr)8, Arg(Me)9,Trp10]MS10 Ac-D-Tyr-Hyp-Alb-Thr-Cha-Gly-Ala(cPr)-Arg(Me)-Trp- NH₂ (Compound No. 956) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Cha6,Gly7Ψ(CH₂CH₂) Leu8,Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-Cha-GlyΨ(CH₂CH₂)Leu-Arg-Trp- NH₂ (Compound No. 957) des(1)-Ac-[D-Tyr2,Hyp3,Alb4,Thr5,Cha6,Gly7Ψ (CH₂CH₂)Leu8,Arg(Me)9,Trp10]MS10 Ac-D-Tyr-Hyp-Alb-Thr-Cha-GlyΨ(CH₂CH₂)Leu-Arg(Me)- Trp-NH₂ (Compound No. 959) des(1)-Ac-[D-Tyr2,Pro(4F)3,Thr5,Cha6,Ala(cPr)8, Arg(Me)9,Trp10]MS10 Ac-D-Tyr-Pro(4F)-Asn-Thr-Cha-Gly-Ala(cPr)-Arg(Me)- Trp-NH₂ (Compound No. 968) des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Phe6Ψ(CH₂CH₂)AzaGly7, Arg(Me)9,Trp10]MS10 Ac-D-Tyr-Hyp-Asn-Thr-PheΨ(CH₂CH₂)AzaGly-Leu-Arg (Me)-Trp-NH₂

The structural formulae of these compounds are shown in TABLE 1.

TABLE 1 Com- pound number Structure 796

803

804

811

818

822

823

827

828

834

839

847

848

849

850

851

852

853

854

855

857

858

859

866

867

869

871

873

875

885

892

893

894

895

902

903

904

905

906

907

908

909

910

911

912

913

914

915

916

917

918

919

920

921

923

924

925

926

927

929

931

932

933

934

940

942

944

945

946

947

948

949

951

952

953

956

957

959

968

The metastin derivatives of the present invention can be prepared by publicly known methods for peptide synthesis. As the methods for peptide synthesis, for example, either solid phase synthesis or liquid phase synthesis may be used. That is, the partial peptide or amino acids that can constitute the peptide of the present invention are repeatedly condensed with the remaining part to give the product having a desired sequence. Where the product has protecting groups, these protecting groups are removed to give the desired peptide. Publicly known methods for condensation and removal of the protecting groups includes those, e.g., described in (1) to (5) below.

-   (1) M. Bodanszky & M. A. Ondetti: Peptide Synthesis, Interscience     Publishers, New York (1966) -   (2) Schroeder & Luebke: The Peptide, Academic Press, New York (1965) -   (3) Nobuo Izumiya, et al.: Peptide Gosei-no-Kiso to Jikken (Basics     and experiments of peptide synthesis), published by Maruzen Co.     (1975) -   (4) Haruaki Yajima & Shunpei Sakakibara: Seikagaku Jikken Koza     (Biochemical Experiment) 1, Tanpakushitsu no Kagaku (Chemistry of     Proteins) IV, 205 (1977) -   (5) Haruaki Yajima, ed.: Zoku Iyakuhin no Kaihatsu (A sequel to     Development of Pharmaceuticals), Vol. 14, Peptide Synthesis,     published by Hirokawa Shoten

After completion of the reaction, the product may be purified and isolated by a combination of conventional purification methods such as solvent extraction, distillation, column chromatography, liquid chromatography and recrystallization to give the peptide of the present invention. When the peptide obtained by the above methods is in a free form, the peptide can be converted into an appropriate salt by a publicly known method; conversely when the peptide is obtained in a salt form, it can be converted into its free form by publicly known methods.

For condensation of the protected amino acids or peptides, a variety of activation reagents for peptide synthesis may be used, but trisphosphonium salts, tetramethyluronium salts, carbodiimides, etc. are particularly preferred. Examples of trisphosphonium salts include benzotriazol-1-yloxytris(pyrrolidino)phosphonium hexafluorophosphate (PyBOP), bromotris(pyrrolidino) phosphonium hexafluorophosphate (PyBroP) and 7-azabenzotriazol-1-yloxytris(pyrrolidino)phosphonium hexafluorophosphate (PyAOP), examples of tetramethyluronium salts include 2-(1H-benzotriazol-1-yl)-1,1,3,3-hexafluorophosphate (HBTU), 2-(7-azabenzotriazol-1-yl)-1,1,3,3-hexafluorophosphate (HATU), 2-(1H-benzotriazol-1-yl)-1,1,3,3-tetramethyluronium tetrafluoroborate (TBTU), 2-(5-norbornene-2,3-dicarboxyimido)-1,1,3,3-tetramethyluronium tetrafluoroborate (TNTU) and O-(N-succinimidyl)-1,1,3,3-tetramethyluronium tetrafluoroborate (TSTU); examples of carbodiimides include DCC, N,N′-diisopropylcarbodiimide (DIPCDI) and N-ethyl-N′-(3-dimethylaminopropyl)carbodiimide hydrochloride (EDCI.HCl); etc. For condensation using these reagents, the addition of racemization inhibitors (e.g., HONB, HOBt, HOAt, HOOBt, etc.) is preferred. Solvents used in condensation may be appropriately chosen from solvents that are known to be usable for condensation. For example, acid amides such as anhydrous or hydrous N,N-dimethylformamide, N,N-dimethylacetamide, N-methylpyrrolidone, etc., halogenated hydrocarbons such as methylene chloride, chloroform, etc., alcohols such as trifluoroethanol, phenol, etc., sulfoxides such as dimethyl sulfoxide, etc., tertiary amines such as pyridine, etc., ethers such as dioxane, tetrahydrofuran, etc., nitriles such as acetonitrile, propionitrile, etc., esters such as methyl acetate, ethyl acetate, etc., or suitable mixtures thereof, etc. are used. The reaction temperature is appropriately chosen from the range known to be applicable to peptide binding reactions and is normally suitably chosen from the range of about −20° C. to 50° C. The activated amino acid derivatives are used generally in 1.5 to 6 times excess. In the case of solid phase synthesis, the condensation is examined using the ninhydrin reaction; when the condensation is insufficient, the condensation can be completed by repeating the condensation reaction without removal of the protecting groups. When the condensation is yet insufficient even after repeating the reaction, the unreacted amino acids are acylated with acetic anhydride or acetylimidazole to cancel any adverse effect on the subsequent reaction.

Examples of the protecting groups used to protect amino groups in the starting amino acids include Z, Boc, tert-pentyloxycarbonyl, isobornyloxycarbonyl, 4-methoxybenzyloxycarbonyl, Cl-Z, Br-Z, adamantyloxycarbonyl, trifluoroacetyl, phthaloyl, formyl, 2-nitrophenylsulphenyl, diphenylphosphinothioyl, Fmoc, trityl, etc.

Examples of protecting groups for a carboxyl group include, in addition to the C₁₋₆ alkyl group, C₃₋₈ cycloalkyl group and C₇₋₁₄ aralkyl group for R described above, allyl, 2-adamantyl, 4-nitrobenzyl, 4-methoxybenzyl, 4-chlorobenzyl, phenacyl group, benzyloxycarbonylhydrazide, tert-butoxycarbonylhydrazide, tritylhydrazide, etc.

The hydroxyl group of serine and threonine can be protected, for example, by esterification or etherification. Examples of groups suitable for this esterification include a group derived from organic acid such as a lower (C₂₋₄) alkanoyl group such as acetyl group, an aroyl group such as benzoyl group, etc. Examples of a group suitable for the etherification include benzyl group, tetrahydropyranyl group, tert-butyl group, trytyl group (Trt), etc.

Examples of groups for protecting the phenolic hydroxyl group of tyrosine include Bzl, 2,6-dichlorobenzyl (Cl₂-Bzl), 2-nitrobenzyl, Br-Z, tert-butyl, etc.

Examples of groups used to protect the imidazole moiety of histidine include Tos, 4-methoxy-2,3,6-trimethylbenzenesulfonyl (Mtr), DNP, Bom, Bum, Boc, Trt, Fmoc, etc. Examples of protecting groups for the guanidino group in arginine include Tos, Z, 4-methoxy-2,3,6-trimethylbenzenesulfonyl (Mtr), p-methoxybenzenesulfonyl (MBS), 2,2,5,7,8-pentamethylchroman-6-sulfonyl (Pmc), mesitylene-2-sulfonyl (Mts), 2,2,4,6,7-pentamethyldihydrobenzofuran-5-sulfonyl (Pbf), Boc, Z, NO₂, etc. Examples of protecting groups for side chain amino group of lysine include Z, Cl-Z, trifluoroacetyl, Boc, Fmoc, Trt, Mtr, 4,4-dimethyl-2,6-dioxocyclohexylideneyl (Dde), etc.

Examples of protecting groups for indolyl of tryptophan include formyl (For), Z, Boc, Mts, Mtr, etc.

Examples of protecting groups for asparagine and glutamine include Trt, xanthyl (Xan), 4,4′-dimethoxybenzhydryl (Mbh), 2,4,6-trimethoxybenzyl (Tmob), etc.

Examples of the activated carboxyl groups in the starting material include the corresponding acid anhydrides, azides, activated esters [esters with alcohols (e.g., pentachlorophenol, 2,4,5-trichlorophenol, 2,4-dinitrophenol, cyanomethyl alcohol, p-nitrophenol, HONB, N-hydroxysuccimide, 1-hydroxybenzotriazole (HOBt) or 1-hydroxy-7-azabenzotriazole (HOAt)], etc. Examples of activated forms of the amino groups in the starting material include the corresponding phosphorous amides.

To eliminate (split off) the protecting groups, there are used catalytic reduction under hydrogen gas flow in the presence of a catalyst such as Pd-black or Pd-carbon; an acid treatment with anhydrous hydrogen fluoride, methanesulfonic acid, trifluoromethanesulfonic acid, trifluoroacetic acid, trimethylsilane bromide (TMSBr), trimethylsilyl trifluoromethanesulfonate, tetrafluoroboric acid, tris(trifluoro)boron, boron tribromide or a mixed solution thereof, a base treatment with diisopropylethylamine, triethylamine, piperidine, piperazine, etc., and reduction with sodium in liquid ammonia. The elimination of protecting groups by the acid treatment described above is carried out generally at a temperature of approximately −20° C. to 40° C. In the acid treatment, it is efficient to add a cation scavenger such as anisole, phenol, thioanisole, m-cresol, p-cresol, etc., dimethylsulfide, 1,4-butanedithiol, 1,2-ethanedithiol, etc. Furthermore, 2,4-dinitrophenyl group used as the protecting group for the imidazole of histidine is removed by a treatment with thiophenol. Formyl group used as the protecting group of the indole of tryptophan is removed by the aforesaid acid treatment in the presence of 1,2-ethanedithiol, 1,4-butanedithiol, etc. as well as by a treatment with an alkali such as a dilute sodium hydroxide solution, dilute ammonia, etc.

Protection of functional groups that should not be involved in the reaction of the starting materials, protecting groups, removal of the protecting groups and activation of functional groups involved in the reaction may be appropriately chosen from publicly known groups and publicly known means.

Methods for obtaining the amide of the peptide include, for example, solid phase synthesis using resins for the formation of peptide amide. In another method for obtaining the amides of the peptide, for example, the α-carboxyl group of the carboxy terminal amino acid is first protected by amidation; the peptide chain is then extended from the amino group side to a desired length. Thereafter, a peptide in which only the protecting group of the N-terminal α-amino group in the peptide chain has been removed from the peptide and a peptide (or an amino acid) in which only the protecting group of the C-terminal carboxyl group has been eliminated are prepared. The two peptides are condensed in a mixture of the solvents described above. The details of the condensation reaction are the same as described above. After the protected peptide obtained by the condensation is purified, all the protecting groups are removed by the method described above to give the desired crude peptide. This crude peptide is purified by various known purification means. Lyophilization of the major fraction gives the amide of the desired peptide.

When the metastin derivative of the present invention is present in the form of a configurational isomer, a diastereomer, a conformer, or the like, each can be isolated by the separating and purifying means described above, if desired. In addition, when the compound of the present invention is racemic, it can be separated into an S isomer and an R isomer by the conventional optical resolving means.

When steric isomers exist in the metastin derivative of the present invention, the present invention includes both of these isomers alone and the isomers present as a mixture thereof.

In addition, the metastin derivative of the present invention may also be hydrated or non-hydrated. The metastin derivative of the present invention may also be labeled with an isotope (e.g., ³H, ¹⁴C, ³⁵S), etc.

Throughout the specification, the peptides are represented in accordance with the conventional way of describing peptides, that is, the N-terminus (amino terminus) at the left hand and the C-terminus (carboxyl terminus) at the right hand. In the peptides, the C-terminus is usually in the form of an amide (-CONH₂), a carboxyl group (-COOH), a carboxylate (-COO⁻), an alkylamide (-CONHR) or an ester (-COOR) and the amide (-CONH₂) is particularly preferred. Examples of R in the ester or alkylamide include a C₁₋₆ alkyl group such as methyl, ethyl, n-propyl, isopropyl, n-butyl, etc.; a C₃₋₈ cycloalkyl group such as cyclopentyl, cyclohexyl, etc.; a C₆₋₁₂ aryl group such as phenyl, α-naphthyl, etc.; a C₇₋₁₄ aralkyl group such as a phenyl-C₁₋₂-alkyl group, e.g., benzyl, phenethyl, etc., or an α-naphthyl-C₁₋₂-alkyl group such as α-naphthylmethyl, etc.; pivaloyloxymethyl group, which are widely used as an ester for oral use, and the like.

Examples of salts of the metastin derivative of the present invention include a metal salt, an ammonium salt, a salt with an organic base, a salt with inorganic acid, a salt with organic acid, a salt with basic or acidic amino acid, and the like. Preferred examples of the metal salts include alkali metal salts such as sodium salts, potassium salts, etc.; alkaline earth metal salts such as calcium salts, magnesium salts, barium salts, etc.; aluminum salts; and the like. Preferred examples of the salts with organic bases include salts with trimethylamine, triethylamine, pyridine, picoline, 2,6-lutidine, ethanolamine, diethanolamine, triethanolamine, cyclohexylamine, dicyclohexylamine, N,N′-dibenzylethylenediamine, etc. Preferred examples of the salts with inorganic acids include salts with hydrochloric acid, hydrobromic acid, nitric acid, sulfuric acid, phosphoric acid, etc. Preferred examples of salts with organic acids include salts with formic acid, acetic acid, trifluoroacetic acid, phthalic acid, fumaric acid, oxalic acid, tartaric acid, maleic acid, citric acid, succinic acid, malic acid, methanesulfonic acid, benzenesulfonic acid, p-toluenesulfonic acid, etc. Preferred examples of salts with basic amino acids include salts with arginine, lysine, ornithine, etc., and preferred examples of salts with acidic amino acids include salts with aspartic acid, glutamic acid, etc.

Of these salts, pharmaceutically acceptable salts are preferable. For example, when the compound has an acidic functional group, inorganic salts such as alkali metal salts (e.g., sodium salts, potassium salts, etc.), alkaline earth metal salts (e.g., calcium salts, magnesium salts, barium salts, etc.), ammonium salts, and the like are preferable. When the compound has a basic functional group, salts with inorganic acids with hydrochloric acid, hydrobromic acid, nitric acid, sulfuric acid, phosphoric acid, etc., and salts with organic acids such as acetic acid, phthalic acid, fumaric acid, oxalic acid, tartaric acid, maleic acid, citric acid, succinic acid, methanesulfonic acid, p-toluenesulfonic acid, etc. are preferable.

The prodrug of the metastin derivative or salts thereof (hereinafter sometimes simply referred to as the metastin derivative of the present invention) is used to mean such a metastin derivative that is converted into the metastin derivative of the present invention under physiological conditions or by reactions with an enzyme, a gastric acid, etc., in vivo. In other words, the prodrug of the present invention refers to the metastin derivative that undergoes enzymatic oxidation, reduction, hydrolysis, etc. to be converted into the metastin derivative of the present invention, or the metastin derivative that undergoes hydrolysis, etc. by gastric acid, etc. to be converted into the metastin derivative of the present invention.

Examples of the prodrug of the metastin derivative of the present invention include metastin derivatives wherein the amino group in the metastin derivative of the present invention is substituted with acyl, alkyl, phosphoric acid, etc. (e.g., metastin derivatives wherein the amino group in the metastin derivative of the present invention is substituted with eicosanoyl, alanyl, pentylaminocarbonyl (5-methyl-2-oxo-1,3-dioxolen-4-yl)methoxycarbonyl, tetrahydrofuranyl, pyrrolidylmethyl, pivaloyloxymethyl, tert-butyl, etc); metastin derivatives wherein the hydroxy group in the metastin derivative of the present invention is substituted with acyl, alkyl, phosphoric acid, boric acid, etc. (e.g., metastin derivatives wherein the hydroxy group in the metastin derivative of the present invention is substituted with acetyl, palmitoyl, propanoyl, pivaloyl, succinyl, fumaryl, alanyl, dimethylaminomethylcarbonyl, etc.); and metastin derivatives wherein the carboxy group in the metastin derivative of the present invention is substituted with ester, amide, etc. (e.g., metastin derivatives wherein the carboxy group of the metastin derivative of the present invention is converted into the ethyl ester, phenyl ester, carboxymethyl ester, dimethylaminomethyl ester, pivaloyloxymethyl ester, ethoxycarbonyloxyethyl ester, phthalidyl ester, (5-methyl-2-oxo-1,3-dioxolen-4-yl)methyl ester, cyclohexyloxycarbonylethyl ester, methylamide, etc); and the like. These metastin derivatives can be produced from the metastin derivatives of the present invention by per se known methods.

The prodrugs of the metastin derivative of the present invention may be those converted into the metastin derivatives of the present invention under the physiological conditions as described in “Pharmaceutical Research and Development”, Vol. 7, Drug Design, pages 163-198, published 1990 by Hirokawa Publishing Co.

The metastin derivative of the present invention or salts thereof and their Prodrugs (hereinafter sometimes briefly referred to as the compound of the present invention) have the cancer metastasis suppressing activity or cancer growth suppressing activity and are useful as medicaments including preventive/therapeutic agents for all cancers (e.g., lung cancer, gastric cancer, liver cancer, pancreatic cancer, colorectal cancer, rectal cancer, colonic cancer, prostate cancer, ovarian cancer, cervical cancer, breast cancer, etc.), as cancer metastasis inhibitors or cancer growth inhibitors.

The compound of the present invention has the effects of regulating functions of the pancreas and is useful as therapeutic/preventive agents for various pancreatic diseases (e.g., acute or chronic pancreatitis, pancreatic cancer, etc.).

The compound of the present invention has the effects of regulating the functions of placenta and is useful as medicaments such as preventive or therapeutic agents for choriocarcinoma, hydatidiform mole, invasive mole, miscarriage, fetal hypoplasia, abnormal glucose metabolism, abnormal lipid metabolism or labor induction.

Also, the compound of the present invention has the effects of increasing sugar level, promoting pancreatic glucagon secretion and promoting urine formation, and, is useful as a hyperglycemic agent, a pancreatic glucagon secretagogue agent or an agent for promoting urine formation, e.g., as medicaments including agents for preventing or treating, obesity, hyperlipemia, type II diabetes mellitus, hypoglycemia, hypertension, diabetic neuropathy, diabetic nephropathy, diabetic retinopathy, edema, urinary disturbances, insulin resistance, unstable diabetes mellitus, fatty atrophy, insulin allergy, insulinoma, arteriosclerosis, thrombotic disorders or lipotoxicity.

In addition, the compound of the present invention has the effects of stimulating gonadotropic hormone (e.g., FSH, LH, etc.) secretion, stimulating sex hormone [e.g., androgens (e.g., testosterone, androstenedione, etc.), estrogens (e.g., estradiol, estrone, etc.), progesterones, etc.] secretion, improving gonadal function and inducing or stimulating ovulation, as well as a sexual maturation effect, etc., and thus can be used as an agent for improving gonadal function, an agent for inducing or stimulating ovulation, a gonadotropic hormone secretagogue agent or a sex hormone secretagogue agent, or an agent for preventing/treating hormone-dependent cancers [e.g., prostate cancer, breast cancer, etc.], infertility [e.g., irregular menstruation, dysmenorrhea, amenorrhea, weight loss-induced amenorrhea, secondary amenorrhea, anovulation, hypoovarianism, hypogonadism, spermatogenetic failure, hypogonadism (e.g., impotence, etc.), genital atrophy, testicular atrophy, testicular function disorder, azoospermia, hypoandrogenemia, etc.], endometriosis, early puberty, myoma of the uterus, etc.

The prodrug of the metastin derivative of the present invention or its salt is also useful as an agent for preventing/treating Alzheimer's disease, moderate cognitive impairment, autism, etc.

Furthermore, the compound of the present invention is useful as an agent for preventing/treating rheumatic diseases (e.g., rheumatoid arthritis, osteoarthritis, gout, etc.) or the like.

Test can be performed by publicly known procedures to determine that the compound is useful for rheumatic diseases. One specific example of the test procedures is described below.

Female LEW rats of 6 weeks old (weighing 150 to 200 g) are used by 8 rats per group. Bovine type II collagen is dissolved in 0.05 mol/L acetic acid solution, which is adjusted to a concentration of 3 mg/mL. An equivolume of FIA (Freund's incomplete adjuvant) is added to prepare an emulsion. The rats are inoculated with the emulsion intracutaneously in the back for sensitization (primary immunization). Seven days after the primary immunization, 0.2 mL of the same emulsion is inoculated intracutaneously at the tail base for booster immunization. On and from the day of booster immunization (Day 0), the vehicle solution and the compound solution are subcutaneously administered consecutively, respectively. On Days 0, 4, 7, 11 and 14, rat rear paw volume is measured using Plethysmometer (UGO BASILE) and the volumes for both rear paws are averaged to give a baseline size of the paws. For assessment of the action on the paw volume, the value obtained by subtracting the pre-value (Day 0) of each animal from the values on Days 4, 7, 11 and 14 is made the value of each animal and provided for statistic calculation.

The compound of the present invention is also useful as:

an agent for preventing/treating autism, immunomodulation (regeneration of thymus, repopulation of thymus, enhanced T cell growth), hypertension, diabetic neuropathy, diabetic nephropathy, diabetic retinopathy, thrombotic disorders or lipotoxicity;

an agent for preventing/treating hyperlipemia, type II diabetes mellitus, hypertension, diabetic neuropathy, diabetic nephropathy or diabetic retinopathy; an antianxiety agent; an antistress agent; an anti-insomnia agent; an antimanic-depressive agent; an agent for preventing/treating hypertension (e.g., essential hypertension, renal hypertension, salt sensitive hypertension, etc.), angina pectoris (e.g., stable angina, unstable angina, etc.), myocardial infarction, cerebrovascular disorders (e.g., asymptomatic cerebrovascular disorder, transient ischemic attack, apoplexy, cerebrovascular dementia, hypertensive encephalopathy, cerebral infarction, etc.), venous insufficiency, obliterative peripheral circulatory disturbances, Raynaud's disease, arteriosclerosis including atherosclerosis (e.g., aneurysm, coronary arteriosclerosis, cerebral arteriosclerosis, peripheral arteriosclerosis, etc.), vascular thickening or occlusion and organ impairments after intervention (e.g., percutaneous coronary intervention, stent placement, coronary thrombolytic therapy, etc.), portal hypertension, respiratory disorders (e.g., asthma, pulmonary hypertension, etc.); an agent for preventing/treating impaired glucose tolerance (IGT); an insulin secretagogue, an inhibitor for transition from IGT to diabetes;

an agent for preventing/treating diabetic complications [e.g., neuropathy, nephropathy, retinopathy, cataract, macroangiopathy, osteopenia, hyperosmolar diabetic coma, infectious diseases (e.g., respiratory infection, urinary tract infection, digestive tract infection, skin soft-tissue infection, lower leg infection), diabetic gangrene, xerostomia, hypacusis, cerebrovascular disorder, peripheral circulatory disturbance], osteoporosis, cachexia (e.g., cancerous cachexia, tuberculous cachexia, diabetic cachexia, blood disease cachexia, endocrine disease cachexia, infectious disease cachexia or cachexia due to acquired immunodeficiency syndrome), fatty liver, polycystic ovary syndrome, renal diseases (e.g., diabetic nephropathy, glomerulonephritis, glomerulosclerosis, nephrotic syndrome, hypertensive nephrosclerosis, end stage kidney disease), muscular dystrophy, cardiac infarction, angina pectoris, cerebrovascular disorders (e.g., cerebral infarction, apoplexy), Alzheimer's disease, Parkinson's disease, dementia, insulin resistance syndrome, X Syndrome X, metabolic syndrome, hyperinsulinemia, hyperinsulinemia-induced sensory disorders, tumors (e.g., leukemia, skin cancer), irritable bowel syndrome, acute or chronic diarrhea, inflammatory diseases (e.g., deforming spondylitis, arthritis deformans, lumbago, gout, postoperative or posttraumatic inflammation, swelling, neuralgia, pharyngolaryngitis, cystitis, hepatitis (including nonalcoholic steatohepatitis), pneumonia, enteritis, inflammatory bowel disorder (including inflammatory bowel diseases), ulcerative colitis, gastric mucosa damage (including gastric mucosa damage induced by aspirin)), damages of small intestinal mucosa, malabsorption, testicular function disorder, visceral obesity syndrome, etc.; and,

for reduction of visceral adiposity, inhibition of visceral fat accumulation, improvement of glucose metabolism, improvement of lipid metabolism, suppression of oxidized LDL production, improvement of lipoprotein metabolism, improvement of coronary artery metabolism, prevention or treatment of cardiovascular complication, prevention or treatment of heart failure complications, decrease in blood remnant, prevention or treatment of anovulation, prevention or treatment of hirsutism or prevention or treatment of hyperandrogenemia; as an agent for improving pancreas (β cells) function, a regenerative agent for pancreas (β cells), an agent for stimulating pancreatic (β cell) regeneration, an appetite regulator, etc.

The compounds described in WO2004/063221, the compounds described in WO2006/001499 and the compounds described in WO2007/072997, or salts thereof, are also useful as agents for preventing/treating rheumatic diseases (e.g., rheumatoid arthritis, osteoarthritis, gout, etc.) or the like.

More specifically, compounds described in WO 2004/063221 (the metastin derivatives (i) represented by, e.g., the formula below, or salts thereof

[wherein,

each of Z¹, Z³, Z⁵ and Z⁷ represents hydrogen atom or a C₁₋₃ alkyl group; each of Z², Z⁴, Z⁶ and Z¹ represents hydrogen atom, O or S;

R¹ represents (1) hydrogen atom, or (2) a C₁₋₈ alkyl group optionally substituted with a substituent selected from the group consisting of an optionally substituted carbamoyl group, an optionally substituted hydroxyl group and an optionally substituted aromatic cyclic group;

R² represents (1) hydrogen atom or (2) a cyclic or linear C₁₋₁₀ alkyl group, or (3) a C₁₋₁₀ alkyl group consisting of a cyclic alkyl group and a linear alkyl group;

R³ represents:

(1) a C₁₋₈ alkyl group having an optionally substituted basic group and optionally having an additional substituent,

(2) an aralkyl group having an optionally substituted basic group and optionally having an additional substituent,

(3) a C₁₋₄ alkyl group having a non-aromatic cyclic hydrocarbon group of carbon atoms not greater than 7 having an optionally substituted basic group, and optionally having an additional substituent, or,

(4) a C₁₋₄ alkyl group having a non-aromatic heterocyclic group of carbon atoms not greater than 7 having an optionally substituted basic group, and optionally having an additional substituent;

R⁴ represents a C₁₋₄ alkyl group, which may optionally be substituted with a substituent selected from the group consisting of:

(1) an optionally substituted C₆₋₁₂ aromatic hydrocarbon group,

(2) an optionally substituted 5- to 14-membered aromatic heterocyclic group consisting of 1 to 7 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms,

(3) an optionally substituted C₈₋₁₄ aromatic fused-ring group,

(4) an optionally substituted 5- to 14-membered aromatic fused heterocyclic group consisting of 3 to 11 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms,

(5) an optionally substituted non-aromatic cyclic hydrocarbon group having carbon atoms not greater than 7, and,

(6) an optionally substituted non-aromatic heterocyclic group having carbon atoms not greater than 7;

X represents a group shown by formula: -NHCH(Q¹)YQ²C(═Z⁹)— (wherein:

Q¹ represents a C₁₋₄ alkyl group, which may optionally be substituted with a substituent selected from the group consisting of:

(1) an optionally substituted C₆₋₁₂ aromatic hydrocarbon group,

(2) an optionally substituted 5- to 14-membered aromatic heterocyclic group consisting of 1 to 7 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms,

(3) an optionally substituted C₈₋₁₄ aromatic fused-ring group,

(4) an optionally substituted 5- to 14-membered aromatic fused heterocyclic group consisting of 3 to 11 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms,

(5) an optionally substituted non-aromatic cyclic hydrocarbon group having carbon atoms not greater than 7, and,

(6) an optionally substituted non-aromatic heterocyclic group having carbon atoms not greater than 7;

Q² represents (1) CH₂, which may optionally be substituted with a C₁₋₄ alkyl group optionally substituted with a substituent selected from the group consisting of carbamoyl group and hydroxyl group, (2) NH, which may optionally be substituted with a C₁₋₄ alkyl group optionally substituted with a substituent selected from the group consisting of carbamoyl group and hydroxyl group, or (3) O;

Y represents a group shown by formula: -CONH-, -CSNH-, -CH₂NH-, -NHCO-, -CH₂O-, -CH₂S- or -CH₂CH₂-, which may optionally be substituted with a C₁₋₆ alkyl group; and,

Z⁹ represents hydrogen atom, O or S); and,

P represents:

(1) hydrogen atom;

(2) an optional amino acid residue continuously or discontinuously bound from the C-terminal end of the 1-48 amino acid sequence in the amino acid sequence represented by SEQ ID NO: 1;

(3) a group represented by formula: J¹-J²-C(J³)(Q³)Y¹C(J⁴)(Q⁴)Y²C(J⁵)(Q⁵)Y³C(J⁶)(Q⁶)C(═Z¹⁰)— (wherein,

J¹ represents (a) hydrogen atom or (b) (i) a C₁₋₁₅ acyl group, (ii) a C₁₋₁₅ alkyl group, (iii) a C₆₋₁₄ aryl group, (iv) a carbamoyl group, (v) a carboxyl group, (vi) a sulfino group, (vii) an amidino group or (viii) a glyoxyloyl group, which groups may optionally be substituted with a substituent containing an optionally substituted cyclic group;

J² represents (1) NH optionally substituted with a C₁₋₆ alkyl group, (2) CH₂ optionally substituted with a C₁₋₆ alkyl group, (3) 0 or (4) S;

each of J³ through J⁶ represents hydrogen atom or a C₁₋₃ alkyl group;

each of Q³ through Q⁶ represents a C₁₋₄ alkyl group, which may optionally be substituted with a substituent selected from the group consisting of:

(1) an optionally substituted C₆₋₁₂ aromatic hydrocarbon group,

(2) an optionally substituted 5- to 14-membered aromatic heterocyclic group consisting of 1 to 7 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms,

(3) an optionally substituted C₈₋₁₄ aromatic fused-ring group,

(4) an optionally substituted 5- to 14-membered aromatic fused heterocyclic group consisting of 3 to 11 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms,

(5) an optionally substituted non-aromatic cyclic hydrocarbon group having carbon atoms not greater than 7,

(6) an optionally substituted non-aromatic heterocyclic group having carbon atoms not greater than 7,

(7) an optionally substituted amino group,

(8) an optionally substituted guanidino group,

(9) an optionally substituted hydroxyl group,

(10) an optionally substituted carboxyl group,

(11) an optionally substituted carbamoyl group, and

(12) an optionally substituted sulfhydryl group, or hydrogen atom;

J³ and Q³, J⁴ and Q⁴, J⁵ and Q⁵ or J⁶ and Q⁶ may be combined together, or, J² and Q³, Y¹ and Q⁴, Y² and Q⁵, or Y³ and Q⁶ may be combined together, to form a ring;

each of Y¹ through Y³ represents a group represented by formula:

-CON(J¹³)-, -CSN(J¹³)-, -C(J¹⁴)N(J¹³)- or -N(J¹³)CO- (wherein each of J¹³ and J¹⁴ represents hydrogen atom or a C₁₋₃ alkyl group); and,

Z¹⁰ represents hydrogen atom, O or S);

(4) a group represented by formula: J¹-J²-C(J⁷)(Q⁷)Y²C(J⁸)(Q⁸)Y³C(J⁹)(Q⁹)C(═Z¹⁰)— (wherein,

J¹ and J² each has the same significance as described above;

J⁷ through J⁹ have the same significance as J³;

Q⁷ through Q⁹ have the same significance as Q³;

Y² and Y³ have the same significance as described above;

Z¹⁰ has the same significance as described above;

J⁷ and Q⁷, J⁸ and Q⁸ or J⁹ and Q⁹ may be combined together, or, J² and Q⁷, Y² and Q⁸ or Y³ and Q⁹ may be combined together, to form a ring);

(5) a group represented by formula: J¹-J²-C(J¹⁰)(Q¹⁰)Y³C(J¹¹)(Q¹¹)C(═Z¹⁰)— (wherein,

J¹ and J² have the same significance as described above represents;

J¹⁰ and J¹¹ have the same significance as J³;

Q¹⁰ and Q¹¹ have the same significance as Q³;

Y³ has the same significance as described above;

Z¹⁰ has the same significance as described above; and,

J¹⁰ and Q¹⁰ or J¹¹ and Q¹¹ may be combined together, or J² and Q¹⁰ or Y³ and Q¹¹ may be combined together, to form a ring);

(6) a group represented by formula: J¹-J²-C(J¹²)(Q¹²)C(═Z¹⁰)—

(wherein,

J¹ and J² have the same significance as described above;

J¹² has the same significance as J³;

Q¹² has the same significance as Q³;

Z¹⁰ has the same significance as described above; and,

J¹² and Q¹² may be combined together, or J² and Q¹² may be combined together, to form a ring); or,

(7) a group represented by formula: J¹- (wherein, J¹ has the same significance as described above)], preferably the following compounds, or salts thereof:

MS10: Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Phe-NH₂       1    2   3   4   5   6   7   8   9   10 Compound No. 17: [Pya(4)10]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Pya(4)-NH₂ Compound No. 18: [Tyr(Me)10]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Tyr(Me)-NH₂ Compound No. 19: [Phe(2F)10]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Phe(2F)-NH₂ Compound No. 23: [Tyr5]MS10 Tyr-Asn-Trp-Asn-Tyr-Phe-Gly-Leu-Arg-Phe-NH₂ Compound No. 24: [Leu5]MS10 Tyr-Asn-Trp-Asn-Leu-Phe-Gly-Leu-Arg-Phe-NH₂ Compound No. 30: Acetyl-MS10 Acetyl-Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Phe-NH₂ Compound No. 31: Fmoc-MS10 Fmoc-Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Phe-NH₂ Compound No. 38: [D-Ser5]MS10 Tyr-Asn-Trp-Asn-D-Ser-Phe-Gly-Leu-Arg-Phe-NH₂ Compound No. 39: [D-Asn4]MS10 Tyr-Asn-Trp-D-Asn-Ser-Phe-Gly-Leu-Arg-Phe-NH₂ Compound No. 40: [D-Trp3]MS10 Tyr-Asn-D-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Phe-NH₂ Compound No. 41: [D-Asn2]MS10 Tyr-D-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Phe-NH₂ Compound No. 42: [D-Tyr1]MS10 D-Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Phe-NH₂ Compound No. 44: [Lys9]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Lys-Phe-NH₂ Compound No. 45: [Ala8]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Ala-Arg-Phe-NH₂ Compound No. 50: [Ala7]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Ala-Leu-Arg-Phe-NH₂ Compound No. 51: [NMePhe10]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-NMePhe-NH₂ Compound No. 53: des(1-3)-Fmoc-MS10 Fmoc-Asn-Ser-Phe-Gly-Leu-Arg-Phe-NH₂ Compound No. 54: des(1-2)-Fmoc-MS10 Fmoc-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Phe-NH₂ Compound No. 55: des(1)-Fmoc-MS10 Fmoc-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Phe-NH₂ Compound No. 56: [Lys2]MS10 Tyr-Lys-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Phe-NH₂ Compound No. 57: [Asp2]MS10 Tyr-Asp-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Phe-NH₂ Compound No. 58: [Tyr2]MS10 Tyr-Tyr-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Phe-NH₂ Compound No. 59: [Leu2]MS10 Tyr-Leu-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Phe-NH₂ Compound No. 60: [Pya(3)10]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Pya(3)-NH₂ Compound No. 61: [Phe(4F)10]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Phe(4F)-NH₂ Compound No. 67: [Ala3]MS10 Tyr-Asn-Ala-Asn-Ser-Phe-Gly-Leu-Arg-Phe-NH₂ Compound No. 68: [Leu3]MS10 Tyr-Asn-Leu-Asn-Ser-Phe-Gly-Leu-Arg-Phe-NH₂ Compound No. 69: [Ser3]MS10 Tyr-Asn-Ser-Asn-Ser-Phe-Gly-Leu-Arg-Phe-NH₂ Compound No. 70: [Asp3]MS10 Tyr-Asn-Asp-Asn-Ser-Phe-Gly-Leu-Arg-Phe-NH₂ Compound No. 71: [Lys3]MS10 Tyr-Asn-Lys-Asn-Ser-Phe-Gly-Leu-Arg-Phe-NH₂ Compound No. 72: [Ala1]MS10 Ala-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Phe-NH₂ Compound No. 73: [Leu1]MS10 Leu-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Phe-NH₂ Compound No. 74: [Ser1]MS10 Ser-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Phe-NH₂ Compound No. 75: [Asp1]MS10 Asp-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Phe-NH₂ Compound No. 76: [Lys1]MS10 Lys-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Phe-NH₂ Compound No. 77: [Phe(4CN)10]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Phe(4CN)-NH₂ Compound No. 78: [Trp(For)3, Phe(4CN)10]MS10 Tyr-Asn-Trp(For)-Asn-Ser-Phe-Gly-Leu-Arg-Phe(4CN)- NH₂ Compound No. 79: [Hph10]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Hph-NH₂ Compound No. 81: [NMeArg9]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-NMeArg-Phe-NH₂ Compound No. 82: [Arg(Me)9]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg(Me)-Phe-NH₂ Compound No. 83: [Arg(asy Me₂)9]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg(asyMe₂)-Phe- NH₂ Compound No. 87: des(4-5)-Boc-MS10 Boc-Tyr-Asn-Trp-Phe-Gly-Leu-Arg-Phe-NH₂ Compound No. 88: des(4-5)-MS10 Tyr-Asn-Trp-Phe-Gly-Leu-Arg-Phe-NH₂ Compound No. 90: [9Ψ10,CH₂NH]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-ArgΨ(CH₂NH)Phe-NH₂ Compound No. 91: [8Ψ9,CH₂NH]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-LeuΨ(CH₂NH)Arg-Phe-NH₂ Compound No. 97: [Har9]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Har-Phe-NH₂ Compound No. 98: [Lys(Me₂)9]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Lys(Me₂)-Phe-NH₂ Compound No. 101: [Ser7]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Ser-Leu-Arg-Phe-NH₂ Compound No. 105: [Nle8]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Nle-Arg-Phe-NH₂ Compound No. 107: [Val8]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Val-Arg-Phe-NH₂ Compound No. 109: [Tyr10]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Tyr-NH₂ Compound No. 110: [Nal(2)10]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Nal(2)-NH₂ Compound No. 111: [Phe(F₅)10]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Phe(F₅)-NH₂ Compound No. 112: [Cha10]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Cha-NH₂ Compound No. 114: des(1-3)-3-(3-Indolyl)propionyl-MS10 3-(3-Indolyl)propionyl-Asn-Ser-Phe-Gly-Leu-Arg- Phe-NH₂ Compound No. 121: des(1-4)-[TrpS]MS10 Trp-Phe-Gly-Leu-Arg-Phe-NH₂ Compound No. 123: [NMeLeu8]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-NMeLeu-Arg-Phe-NH₂ Compound No. 126: [NMeSer5]MS10 Tyr-Asn-Trp-Asn-NMeSer-Phe-Gly-Leu-Arg-Phe-NH₂ Compound No. 127: [D-Asn4,NMePhe6]MS10 Tyr-Asn-Trp-D-Asn-Ser-NMePhe-Gly-Leu-Arg-Phe-NH₂ Compound No. 128: [10Ψ, CSNH]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-G1y-Leu-Arg-PheΨ(CSNH)NH₂ Compound No. 129: [Arg(symMe₂)9]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg(symMe₂)-Phe- NH₂ Compound No. 130: [Phe(4Cl)10]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Phe(4Cl)-NH₂ Compound No. 131: [Phe(4NH₂)10]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Phe(4NH₂)-NH₂ Compound No. 132: [Phe(4NO₂)10]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Phe(4NO₂)-NH₂ Compound No. 133: [Nal(1)10]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Nal(1)-NH₂ Compound No. 134: [Trp10]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Trp-NH₂ Compound No. 137: [Nle9]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Nle-Phe-NH₂ Compound No. 138: [Cit9]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Cit-Phe-NH₂ Compound No. 140: [Arg(Me)9, NMePhe10]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg(Me)-NMePhe-NH₂ Compound No. 141: [D-Tyr1,Arg(Me)9]MS10 D-Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg(Me)-Phe-NH₂ Compound No. 142: [D-Tyr1,D-Trp3,Arg(Me)9]MS10 D-Tyr-Asn-D-Trp-Asn-Ser-Phe-Gly-Leu-Arg(Me)-Phe- NH₂ Compound No. 143: [D-Trp3,Arg(Me)9]MS10 Tyr-Asn-D-Trp-Asn-Ser-Phe-Gly-Leu-Arg(Me)-Phe-NH₂ Compound No. 144: des(1-3)-Fmoc-[Arg(Me)9]MS10 Fmoc-Asn-Ser-Phe-Gly-Leu-Arg(Me)-Phe-NH₂ Compound No. 145: des(1-2)-Fmoc-[Arg(Me)9]MS10 Fmoc-Trp-Asn-Ser-Phe-Gly-Leu-Arg(Me)-Phe-NH₂ Compound No. 146: [10Ψ,CSNH,D-Tyr1]MS10 D-Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-PheΨ(CSNH) NH₂ Compound No. 150: [Tyr6]MS10 Tyr-Asn-Trp-Asn-Ser-Tyr-Gly-Leu-Arg-Phe-NH₂ Compound No. 151: [Nal(1)6]MS10 Tyr-Asn-Trp-Asn-Ser-Nal(1)-Gly-Leu-Arg-Phe-NH₂ Compound No. 152: [Nal(2)6]MS10 Tyr-Asn-Trp-Asn-Ser-Nal(2)-Gly-Leu-Arg-Phe-NH₂ Compound No. 153: [Phe(F5)6]MS10 Tyr-Asn-Trp-Asn-Ser-Phe(F5)-Gly-Leu-Arg-Phe-NH₂ Compound No. 154: [Phe(4F)6]MS10 Tyr-Asn-Trp-Asn-Ser-Phe(4F)-Gly-Leu-Arg-Phe-NH₂ Compound No. 156: [Cha6]MS10 Tyr-Asn-Trp-Asn-Ser-Cha-Gly-Leu-Arg-Phe-NH₂ Compound No. 163: [6Ψ7,CH₂NH]MS10 Tyr-Asn-Trp-Asn-Ser-PheΨ(CH₂NH)Gly-Leu-Arg-Phe-NH₂ Compound No. 165: [Dap(Gly)9]-MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Dap(Gly)-Phe-NH₂ Compound No. 166: [6Ψ7,CSNH]MS10 Tyr-Asn-Trp-Asn-Ser-PheΨ(CSNH)Gly-Leu-Arg-Phe-NH₂ Compound No. 169: [D-Tyr1,Ala3,Arg(Me)9]MS10 D-Tyr-Asn-Ala-Asn-Ser-Phe-Gly-Leu-Arg(Me)-Phe-NH₂ Compound No. 170: [D-Tyr1,Ser3,Arg(Me)9]MS10 D-Tyr-Asn-Ser-Asn-Ser-Phe-Gly-Leu-Arg(Me)-Phe-NH₂ Compound No. 171: [D-Tyr1,Cha3,Arg(Me)9]MS10 D-Tyr-Asn-Cha-Asn-Ser-Phe-Gly-Leu-Arg(Me)-Phe-NH₂ Compound No. 172: [D-Tyr1,Cha6,Arg(Me)9]MS10 D-Tyr-Asn-Trp-Asn-Ser-Cha-Gly-Leu-Arg(Me)-Phe-NH₂ Compound No. 173: [D-Tyr1,Ala7,Arg(Me)9]MS10 D-Tyr-Asn-Trp-Asn-Ser-Phe-Ala-Leu-Arg(Me)-Phe-NH₂ Compound No. 174: [D-Tyr1,Arg(Me)9,Trp10]MS10 D-Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg(Me)-Trp-NH₂ Compound No. 176: [AzaGly7]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-AzaGly-Leu-Arg-Phe-NH₂ Compound No. 181: [D-Tyr1,Cha3,6,Arg(Me)9]MS10 D-Tyr-Asn-Cha-Asn-Ser-Cha-Gly-Leu-Arg(Me)-Phe-NH₂ Compound No. 182: [D-Tyr1,Cha3,6,Arg(Me)9,Trp10]MS10 D-Tyr-Asn-Cha-Asn-Ser-Cha-Gly-Leu-Arg(Me)-Trp-NH₂ Compound No. 183: [Phe(4NH₂)9]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Phe(4NH₂)-Phe-NH₂ Compound No. 184: [Phe(4-Guanidino)9]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Phe(4-Guanidino)- Phe-NH₂ Compound No. 185: [Dap(GnGly)9]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Dap(GnGly)-Phe-NH₂ Compound No. 186: [Trp(For)10]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Trp(For)NH₂ Compound No. 187: [Abu8]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Abu-Arg-Phe-NH₂ Compound No. 189: [Ala(3-Bzt)10]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Ala(3-Bzt)-NH₂ Compound No. 190: [D-Tyr1,Cha3,AzaGly7,Arg(Me)9]MS10 D-Tyr-Asn-Cha-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)-Phe- NH₂ Compound No. 191: [D-Tyr1,Ser3,AzaGly7,Arg(Me)9]MS10 D-Tyr-Asn-Ser-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)-Phe- NH₂ Compound No. 192: [D-Tyr1,Arg(Et)9]MS10 D-Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg(Et)-Phe-NH₂ Compound No. 193: [D-Tyr1,Arg(n-Pr)9]MS10 D-Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg(n-Pr)-Phe- NH₂ Compound No. 194: [D-Tyr1,Arg(Ac)9]MS10 D-Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg(Ac)-Phe-NH₂ Compound No. 197: [Phe(3F)10]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Phe(3F)-NH₂ Compound No. 198: [Phe(3,4F2)10]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Phe(3,4F2)- NH₂ Compound No. 199: [Phe(3,4Cl₂)10]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Phe(3,4Cl₂)- NH₂ Compound No. 200: [Phe(3CF₃)10]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Phe(3CF₃)-NH₂ Compound No. 201: [Ala(2-Qui)10]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Ala(2-Qui)-NH₂ Compound No. 203: [D-Tyr1,Cha6,Arg(Me)9]MS10 D-Tyr-Asn-Trp-Asn-Ser-Cha-Gly-Leu-Arg(Me)-Phe-NH₂ Compound No. 204: [D-Tyr1,Ala7,Arg(Me)9]MS10 D-Tyr-Asn-Trp-Asn-Ser-Phe-Ala-Leu-Arg(Me)-Phe-NH₂ Compound No. 205: [D-Tyr1,Thr3,Arg(Me)9]MS10 D-Tyr-Asn-Thr-Asn-Ser-Phe-Gly-Leu-Arg(Me)-Phe-NH₂ Compound No. 206: [D-Tyr1,Ile3,Arg(Me)9]MS10 D-Tyr-Asn-Ile-Asn-Ser-Phe-Gly-Leu-Arg(Me)-Phe-NH₂ Compound No. 207: [D-Tyr1,Ser4,Arg(Me)9]MS10 D-Tyr-Asn-Trp-Ser-Ser-Phe-Gly-Leu-Arg(Me)-Phe-NH₂ Compound No. 208: [D-Tyr1,Thr4,Arg(Me)9]MS10 D-Tyr-Asn-Trp-Thr-Ser-Phe-Gly-Leu-Arg(Me)-Phe-NH₂ Compound No. 209: [D-Tyr1,Gln4,Arg(Me)9]MS10 D-Tyr-Asn-Trp-Gln-Ser-Phe-Gly-Leu-Arg(Me)-Phe-NH₂ Compound No. 210: [D-Tyr1,Ala4,Arg(Me)9]MS10 D-Tyr-Asn-Trp-Ala-Ser-Phe-Gly-Leu-Arg(Me)-Phe-NH₂ Compound No. 211: [D-Tyr1,Thr5,Arg(Me)9]MS10 D-Tyr-Asn-Trp-Asn-Thr-Phe-Gly-Leu-Arg(Me)-Phe-NH₂ Compound No. 212: [D-Tyr1,Ala5,Arg(Me)9]MS10 D-Tyr-Asn-Trp-Asn-Ala-Phe-Gly-Leu-Arg(Me)-Phe-NH₂ Compound No. 213: [D-Tyr1,Val8,Arg(Me)9]MS10 D-Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Val-Arg(Me)-Phe-NH₂ Compound No. 214: [D-Tyr1,Gln2,Arg(Me)9]MS10 D-Tyr-Gln-Trp-Asn-Ser-Phe-Gly-Leu-Arg(Me)-Phe-NH₂ Compound No. 215: [D-Tyr1,Thr2,Arg(Me)9]MS10 D-Tyr-Thr-Trp-Asn-Ser-Phe-Gly-Leu-Arg(Me)-Phe-NH₂ Compound No. 216: des(1)-[D-Asn2,Arg(Me)9]MS10 D-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg(Me)-Phe-NH₂ Compound No. 217: des(1)-[D-Tyr2,Arg(Me)9]MS10 D-Tyr-Trp-Asn-Ser-Phe-Gly-Leu-Arg(Me)-Phe-NH₂ Compound No. 218: [N((CH₂)3Gn)]Gly9]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-N((CH₂)3Gn)Gly- Phe-NH₂ Compound No. 220: [Arg(Et)9]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg(Et)-Phe-NH₂ Compound No. 221: [D-Tyr1,Thr3,AzaGly7,Arg(Me)9]MS10 D-Tyr-Asn-Thr-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)-Phe- NH₂ Compound No. 222: des(1)-[D-Tyr2,AzaGly7,Arg(Me)9]MS10 D-Tyr-Trp-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)-Phe-NH₂ Compound No. 223: des(1-2)-[D-Trp3,Arg(Me)9]MS10 D-Trp-Asn-Ser-Phe-Gly-Leu-Arg(Me)-Phe-NH₂ Compound No. 224: des(1)-[D-Tyr2,D-Trp3,Arg(Me)9]MS10 D-Tyr-D-Trp-Asn-Ser-Phe-Gly-Leu-Arg(Me)-Phe-NH₂ Compound No. 225: des(1)-[D-Asn2,D-Trp3,Arg(Me)9]MS10 D-Asn-D-Trp-Asn-Ser-Phe-Gly-Leu-Arg(Me)-Phe-NH₂ Compound No. 226: des(1)-[D-Tyr2,Ser3,Arg(Me)9]MS10 D-Tyr-Ser-Asn-Ser-Phe-Gly-Leu-Arg(Me)-Phe-NH₂ Compound No. 227: des(1)-[D-Tyr2,Thr3,Arg(Me)9]MS10 D-Tyr-Thr-Asn-Ser-Phe-Gly-Leu-Arg(Me)-Phe-NH₂ Compound No. 228: des(1)-[D-Tyr2,Ile3,Arg(Me)9]MS10 D-Tyr-Ile-Asn-Ser-Phe-Gly-Leu-Arg(Me)-Phe-NH₂ Compound No. 229: [D-Tyr1,Val3,Arg(Me)9]MS10 D-Tyr-Asn-Val-Asn-Ser-Phe-Gly-Leu-Arg(Me)-Phe-NH₂ Compound No. 230: [D-Tyr1,D-Asn2,Arg(Me)9]MS10 D-Tyr-D-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg(Me)-Phe- NH₂ Compound No. 231: [D-Tyr1,D-Asn2,D-Trp3,Arg(Me)9]MS10 D-Tyr-D-Asn-D-Trp-Asn-Ser-Phe-Gly-Leu-Arg(Me)-Phe- NH₂ Compound No. 232: [D-Tyr1,AzaGly7,Arg(Me)9]MS10 D-Tyr-Asn-Trp-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)-Phe- NH₂ Compound No. 233: [D-Tyr1,Ile3,AzaGly7,Arg(Me)9]MS10 D-Tyr-Asn-Ile-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)-Phe- NH₂ Compound No. 234: [D-Tyr1,Val3,AzaGly7,Arg(Me)9]MS10 D-Tyr-Asn-Val-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)-Phe- NH₂ Compound No. 235: [D-Tyr1,Ala3,AzaGly7,Arg(Me)9]MS10 D-Tyr-Asn-Ala-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)-Phe- NH₂ Compound No. 236: [D-Tyr1,D-Trp3,AzaGly7,Arg(Me)9]MS10 D-Tyr-Asn-D-Trp-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)- Phe-NH₂ Compound No. 237: [D-Tyr1,D-Asn2,AzaGly7,Arg(Me)9]MS10 D-Tyr-D-Asn-Trp-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)- Phe-NH₂ Compound No. 238: [D-Tyr1,D-Asn2,D-Trp3,AzaGly7,Arg(Me)9]MS10 D-Tyr-D-Asn-D-Trp-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)- Phe-NH₂ Compound No. 239: des(1)-[D-Tyr2,Ser3,AzaGly7,Arg(Me)9]MS10 D-Tyr-Ser-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)-Phe-NH₂ Compound No. 240: des(1)-[D-Tyr2,Ile3,AzaGly7,Arg(Me)9]MS10 D-Tyr-IIe-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)-Phe-NH₂ Compound No. 241: des(1)-[D-Tyr2,Thr3,AzaGly7,Arg(Me)9]MS10 D-Tyr-Thr-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)-Phe-NH₂ Compound No. 242: des(1)-[D-Tyr2,D-Trp3,AzaGly7,Arg(Me)9]MS10 D-Tyr-D-Trp-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)-Phe-NH₂ Compound No. 244: [D-Tyr1,Phe3,AzaGly7,Arg(Me)9]MS10 D-Tyr-Asn-Phe-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)-Phe- NH₂ Compound No. 245: [D-Tyr1,Nal(1)3,AzaGly7,Arg(Me)9]MS10 D-Tyr-Asn-Nal(1)-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)- Phe-NH₂ Compound No. 246: [D-Tyr1-Nal(2)3,AzaGly7,Arg(Me)9]MS10 D-Tyr-Asn-Nal(2)-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)- Phe-NH₂ Compound No. 247: [D-Tyr1,Phe(2Cl)3,AzaGly7,Arg(Me)9]MS10 D-Tyr-Asn-Phe(2Cl)-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)- Phe-NH₂ Compound No. 248: [D-Tyr1,Phe(3Cl)3,AzaGly7,Arg(Me)9]MS10 D-Tyr-Asn-Phe(3Cl)-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)- Phe-NH₂ Compound No. 249: [D-Tyr1,Phe(4Cl)3,AzaGly7,Arg(Me)9]MS10 D-Tyr-Asn-Phe(4C1)-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)- Phe-NH₂ Compound No. 250: [D-Tyr1,Phe(4NH₂)3,AzaGly7,Arg(Me)9]MS10 D-Tyr-Asn-Phe(4NH₂)-Asn-Ser-Phe-AzaGly-Leu-Arg (Me)-Phe-NH₂ Compound No. 251: [D-Tyr1,Pya(3)3,AzaGly7,Arg(Me)9]MS10 D-Tyr-Asn-Pya(3)-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)- Phe-NH₂ Compound No. 252: [D-Tyr1,D-Ala3,AzaGly7,Arg(Me)9]MS10 D-Tyr-Asn-D-Ala-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)- Phe-NH₂ Compound No. 253: [D-Tyr1,Pro3,AzaGly7,Arg(Me)9]MS10 D-Tyr-Asn-Pro-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)-Phe- NH₂ Compound No. 254: des(1)-[D-Tyr2,Phe3,AzaGly7,Arg(Me)9]MS10 D-Tyr-Phe-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)-Phe-NH₂ Compound No. 255: des(1)-[D-Tyr2,Nal(2)3,AzaGly7,Arg(Me)9]MS10 D-Tyr-Nal(2)-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)-Phe- NH₂ Compound No. 256: des(1)-[D-Pya(3)2,Phe3,AzaGly7,Arg(Me)9]MS10 D-Pya(3)-Phe-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)-Phe- NH₂ Compound No. 257: [D-Tyr1,D-Asn2,Phe3,AzaGly7,Arg(Me)9]MS10 D-Tyr-D-Asn-Phe-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)- Phe-NH₂ Compound No. 258: [D-Pya(3)1,AzaGly7,Arg(Me)9]MS10 D-Pya(3)-Asn-Trp-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)- Phe-NH₂ Compound No. 259: [D-Ala1,AzaGly7,Arg(Me)9]MS10 D-Ala-Asn-Trp-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)-Phe- NH₂ Compound No. 260: des(1-3)-3-(3-Indolyl)propionyl-[AzaGly7,Arg(Me)9] MS10 3-(3-Indolyl)propionyl-Asn-Ser-Phe-AzaGly-Leu-Arg (Me)-Phe-NH₂ Compound No. 261: [7Ψ8,CH₂NH]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-GlyΨ(CH₂NH)Leu-Arg-Phe-NH₂ Compound No. 265: des(1-3)-Indole-3-carbonyl-[AzaGly7,Arg(Me)9]MS10 Indole-3-carbonyl-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)- Phe-NH₂ Compound No. 266: des(1-3)-Indole-3-acetyl-[AzaGly7,Arg(Me)9]MS10 Indol-3-acetyl-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)-Phe- NH₂ Compound No. 267: des(1-3)-4-(3-Indolyl)butyryl-[AzaGly7,Arg(Me)9] MS10 4-(3-Indolyl)butyryl-Asn-Ser-Phe-AzaGly-Leu-Arg (Me)-Phe-NH₂ Compound No. 268: des(1-3)-Diphenylacetyl-[AzaGly7,Arg(Me)9]MS10 Diphenylacetyl-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)-Phe- NH₂ Compound No. 269: des(1-3)-3-Phenylpropionyl-[AzaGly7,Arg(Me)9]MS10 3-Phenylpropionyl-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)- Phe-NH₂ Compound No. 270: [D-Tyr1,Phe3,Ser-Phe5,AzaGly7,Arg(Me)9]MS10 D-Tyr-Asn-Phe-Asn-Ser-Phe-Phe-AzaGly-Leu-Arg(Me)- Phe-NH₂ Compound No. 271: des(1-2)-[AzaGly7,Arg(Me)9]MS10 Trp-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)-Phe-NH₂ Compound No. 272: des(1-2)-Acetyl-[AzaGly7,Arg(Me)9]MS10 Acetyl-Trp-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)-Phe-NH₂ Compound No. 273: des(1-2)-Amidino-[AzaGly7,Arg(Me)9]MS10 Amidino-Trp-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)-Phe-NH₂ Compound No. 274: des(1-2)-Acetyl-[Ala3,AzaGly7,Arg(Me)9]MS10 Acetyl-Ala-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)-Phe-NH₂ Compound No. 275: des(1-2)-Acetyl-[Arg3,AzaGly7,Arg(Me)9]MS10 Acetyl-Arg-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)-Phe-NH₂ Compound No. 276: des(1-2)-Acetyl-[Thr3,AzaGly7,Arg(Me)9]MS10 Acetyl-Thr-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)-Phe-NH₂ Compound No. 277: des(1-3)-n-Hexanoyl-[AzaGly7,Arg(Me)9]MS10 n-Hexanoyl-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)-Phe-NH₂ Compound No. 278: des(1-3)-Cyclohexanecarbonyl-[AzaGly7,Arg(Me)9] MS10 Cyclohexanecarbonyl-Asn-Ser-Phe-AzaGly-Leu-Arg (Me)-Phe-NH₂ Compound No. 279: des(1-3)-2-(Indol-3-yl)ethylcarbamoyl-[AzaGly7,Arg (Me)9]MS10 2-(indol-3-yl)ethylcarbamoyl-Asn-Ser-Phe-AzaGly- Leu-Arg(Me)-Phe-NH₂ Compound No. 281: [D-Tyr1,Pya(2)6,Arg(Me)9]MS10 D-Tyr-Asn-Trp-Asn-Ser-Pya(2)-Gly-Leu-Arg(Me)-Phe- NH₂ Compound No. 282: [D-Tyr1,Pya(4)6,Arg(Me)9]MS10 D-Tyr-Asn-Trp-Asn-Ser-Pya(4)-Gly-Leu-Arg(Me)-Phe- NH₂ Compound No. 283: [D-Tyr1,D-Asn2,Cha3,AzaGly7,Arg(Me)9]MS10 D-Tyr-D-Asn-Cha-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)- Phe-NH₂ Compound No. 284: [D-Tyr1,D-Asn2,Thr3,AzaGly7,Arg(Me)9]MS10 D-Tyr-D-Asn-Thr-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)- Phe-NH₂ Compound No. 285: [D-Tyr1,Pya(2)3,AzaGly7,Arg(Me)9]MS10 D-Tyr-Asn-Pya(2)-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)- Phe-NH₂ Compound No. 286: [D-Tyr1,Pya(4)3,AzaGly7,Arg(Me)9]MS10 D-Tyr-Asn-Pya(4)-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)- Phe-NH₂ Compound No. 287: [D-Tyr1,D-Ser2,AzaGly7,Arg(Me)9]MS10 D-Tyr-D-Ser-Trp-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)- Phe-NH₂ Compound No. 288: [D-Tyr1,D-His2,AzaGly7,Arg(Me)9]MS10 D-Tyr-D-His-Trp-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)- Phe-NH₂ Compound No. 289: des(1)-[D-Pya(3)2,AzaGly7,Arg(Me)9]MS10 D-Pya(3)-Trp-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)-Phe- NH₂ Compound No. 290: [D-Pya(3)1,D-Asn2,Cha3,AzaGly7,Arg(Me)9]MS10 D-Pya(3)-D-Asn-Cha-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)- Phe-NH₂ Compound No. 291: [D-Pya(3)1,D-Tyr2,Cha3,AzaGly7,Arg(Me)9]MS10 D-Pya(3)-D-Tyr-Cha-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)- Phe-NH₂ Compound No. 293: [4Ψ5,CH₂NH]MS10 Tyr-Asn-Trp-Asn-Ψ(CH₂NH)Ser-Phe-Gly-Leu-Arg-Phe- NH₂ Compound No. 294: [1Ψ2,CH₂NH]MS10 TyrΨ(CH₂NH)Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Phe-NH₂ Compound No. 295: [2Ψ3,CH₂NH]MS10 Tyr-AsnΨ(CH₂NH)Trp-Asn-Ser-Phe-Gly-Leu-Arg-Phe-NH₂ Compound No. 296: [6Ψ7,CSNH,D-Tyr1,Arg(Me)9]MS10 D-Tyr-Asn-Trp-Asn-Ser-PheΨ(CSNH)Gly-Leu-Arg(Me)- Phe-NH₂ Compound No. 297: [D-Tyr1,Thr5,AzaGly7,Arg(Me)9]MS10 D-Tyr-Asn-Trp-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Phe- NH₂ Compound No. 298: [D-Tyr1,D-Asn2,Thr5,AzaGly7,Arg(Me)9]MS10 D-Tyr-D-Asn-Trp-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)- Phe-NH₂ Compound No. 299: [1Ψ2,CH₂NH,AzaGly7,Arg(Me)9]-MS10 TyrΨ(CH₂NH)Asn-Trp-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)- Phe-NH₂ Compound No. 300: [1Ψ2,CH₂NH,D-Trp3,AzaGly7,Arg(Me)9]-MS10 TyrΨ(CH₂NH)Asn-D-Trp-Asn-Ser-Phe-AzaGly-Leu-Arg (Me)-Phe-NH₂ Compound No. 301: [D-Tyr1,Ala(2-Qui)3,AzaGly7,Arg(Me)9]MS10 D-Tyr-Asn-Ala(2-Qui)-Asn-Ser-Phe-AzaGly-Leu-Arg (Me)-Phe-NH₂ Compound No. 302: [D-Tyr1,D-Pya(4)3,AzaGly7,Arg(Me)9]MS10 D-Tyr-Asn-D-Pya(4)-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)- Phe-NH₂ Compound No. 303: [D-Tyr1,D-Asn2,Pya(4)3,AzaGly7,Arg(Me)9]MS10 D-Tyr-D-Asn-Pya(4)-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)- Phe-NH₂ Compound No. 304: [D-Asn2,Pya(4)3,AzaGly7,Arg(Me)9]MS10 Tyr-D-Asn-Pya(4)-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)- Phe-NH₂ Compound No. 305: des(1)-[D-Tyr2,D-Pya(4)3-AzaGly7,Arg(Me)9]MS10 D-Tyr-D-Pya(4)-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)-Phe- NH₂ Compound No. 306: [D-Pya(4)1-D-Asn2,Cha3,AzaGly7,Arg(Me)9]MS10 D-Pya(4)-D-Asn-Cha-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)- Phe-NH₂ Compound No. 307: [7Ψ8,CH₂NH,D-Tyr1,Arg(Me)9]MS10 D-Tyr-Asn-Trp-Asn-Ser-Phe-GlyΨ(CH₂NH)Leu-Arg(Me)- Phe-NH₂ Compound No. 308: [6Ψ7,CH₂NH,D-Tyr1,Arg(Me)9]MS10 D-Tyr-Asn-Trp-Asn-Ser-PheΨ(CH₂NH)Gly-Leu-Arg(Me)- Phe-NH₂ Compound No. 310: [Nar9]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Nar-Phe-NH₂ Compound No. 311: [Nar(Me)9]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Nar(Me)-Phe-NH₂ Compound No. 312: [Har(Me)9]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Har(Me)-Phe-NH₂ Compound No. 313: [Dab9]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Dab-Phe-NH₂ Compound No. 314: [Orn9]MS10 Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Orn-Phe-NH₂ Compound No. 315: des(1)-[D-Asn2,Cha3,AzaGly7,Arg(Me)9]MS10 D-Asn-Cha-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)-Phe-NH₂ Compound No. 316: [D-Tyr1,D-Asn2,Thr3,AzaGly7,Arg(Me)9,Phe(4F)10] MS10 D-Tyr-D-Asn-Thr-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)-Phe (4F)-NH₂ Compound No. 317: [D-Tyr1,D-Asn2,Pya(4)3,AzaGly7,Arg(Me)9,Phe(4F)10] MS10 D-Tyr-D-Asn-Pya(4)-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)- Phe(4F)-NH₂ Compound No. 318: [D-Tyr1,AzaGly7,Arg(Me)9,Phe(4F)10]MS10 D-Tyr-Asn-Trp-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)-Phe (4F)-NH₂ Compound No. 319: [6Ψ7,NHCO,D-Tyr1,Arg(Me)9]MS10 D-Tyr-Asn-Trp-Asn-Ser-PheΨ(NHCO)Gly-Leu-Arg(Me)- Phe-NH₂ Compound No. 322: des(1-3)-3-Pyridylpropionyl-[AzaGly7,Arg(Me)9] MS10 3-Pyridylpropionyl-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)- Phe-NH₂ Compound No. 323: des(1-3)-4-Imidazoleacetyl-[AzaGly7,Arg(Me)9]MS10 4-Imidazoleacetyl-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)- Phe-NH₂ Compound No. 324: des(1-3)-4-Piperidinecarbonyl-[AzaGly7,Arg(Me)9] MS10 Piperidinecarbonyl-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)- Phe-NH₂ Compound No. 325: des(1-3)-1-Piperidineacetyl-[AzaGly7,Arg(Me)9] MS10 Piperidineacetyl-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)- Phe-NH₂ Compound No. 326: des(1-3)-1-Methylpiperidinio-1-acetyl-[AzaGly7, Arg(Me)9]MS10 Methylpiperidino-1-acetyl-Asn-Ser-Phe-AzaGly-Leu- Arg(Me)-Phe-NH₂ Compound No. 327: des(1-3)-1-Pyridinioacetyl-[AzaGly7,Arg(Me)9]MS10 1-Pyridinoacetyl-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)- Phe-NH₂ Compound No. 328: des(1-3)-D-Glucronyl-[AzaGly7,Arg(Me)9]MS10 D-Glucronyl-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)-Phe-NH₂ Compound No. 375: 2-Aminoethyl-Gly-[D-Tyr1,Arg(Me)9]MS10 2-Aminoethyl-Gly-D-Tyr-Asn-Trp-Asn-Ser-Phe-Gly- Leu-Arg(Me)-Phe-NH₂ Compound No. 385: des(1)-[D-Tyr2,D-Pya(4)3,AzaGly7,Arg(Me)9,Trp10] MS10 D-Tyr-D-Pya(4)-Asn-Ser-Phe-MaGly-Leu-Arg(Me)9, Trp-NH₂ Compound No. 386: des(1-3)-3-Pyridyipropionyl-[AzaGly7,Arg(Me)9,Trp 10]MS10 3-Pyridylpropionyl-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)- Trp-NH₂ Compound No. 387: Dap-[D-Tyr1,Arg(Me)9]MS10 Dap-D-Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg(Me)-Phe- NH₂ Compound No. 397: Methylthiocarbamoyl-Sar-[D-Tyr1,Arg(Me)9]MS10 Methylthiocarbamoyl-Sar-D-tyr-Asn-Trp-Asn-Ser-Phe- Gly-Leu-Arg(Me)-Phe-NH₂ Compound No. 400: (S)-1-(Quinolin-8-yl-carbamoyl)-4-thiapentyl- carbamoyl-[D-Tyr1,Arg(Me)9]MS10 (S)-1-(Quinolin-8-yl-carbamoyl)-4-thiapentyl- carbamoyl-D-Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg (Me)-Phe-NH_(2;)

Compounds described in WO 2006/001499 (the metastin derivatives (ii) represented by, e.g., the formula below, or salts thereof:

[wherein; V represents a group represented by formula:

or a group represented by formula:

n represents 0 or 1;

W¹ represents N, CH or O (provided that when W¹ is N or CH, n represents 1 and when W¹ is O, n represents 0);

W² represents N or CH;

Z¹, Z³, Z⁵ and Z⁷ each represents hydrogen atom or a C₁₋₃ alkyl group;

Z⁴, Z⁶ and Z⁸ each represents hydrogen atom, O or S;

R² represents (1) hydrogen atom or (2) a cyclic or linear C₁₋₁₀ alkyl group, (3) a C₁₋₁₀ alkyl group consisting of a cyclic alkyl group and a linear alkyl group, or (4) a C₁₋₈ alkyl group optionally substituted with a substituent selected from the group consisting of an optionally substituted carbamoyl group, an optionally substituted hydroxyl group and an optionally substituted aromatic cyclic group;

R³ represents (1) a C₁₋₈ alkyl group having an optionally substituted basic group and optionally having an additional substituent, (2) an aralkyl group having an optionally substituted basic group and optionally having an additional substituent, (3) a C₁₋₄ alkyl group having a non-aromatic cyclic hydrocarbon group of carbon atoms not greater than 7 having an optionally substituted basic group, and optionally having an additional substituent, or (4) a C₁₋₄ alkyl group having a non-aromatic heterocyclic group of carbon atoms not greater than 7 having an optionally substituted basic group, and optionally having an additional substituent;

R⁴ represents a C₁₋₄ alkyl group, which may optionally be substituted with a substituent selected from the group consisting of (1) an optionally substituted C₆₋₁₂ aromatic hydrocarbon group, (2) an optionally substituted 5- to 14-membered aromatic heterocyclic group consisting of 1 to 7 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms, (3) an optionally substituted C₈₋₁₄ aromatic fused-ring group, (4) an optionally substituted 5- to 14-membered aromatic fused heterocyclic group consisting of 3 to 11 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms, (5) an optionally substituted non-aromatic cyclic hydrocarbon group having carbon atoms not greater than 7, and (6) an optionally substituted non-aromatic heterocyclic group having carbon atoms not greater than 7;

Q¹ represents a C₁₋₄ alkyl group, which may optionally be substituted with a substituent selected from the group consisting of (1) an optionally substituted C₆₋₁₂ aromatic hydrocarbon group, (2) an optionally substituted 5- to 14-membered aromatic heterocyclic group consisting of 1 to 7 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms, (3) an optionally substituted C₈₋₁₄ aromatic fused-ring group, (4) an optionally substituted 5- to 14-membered aromatic fused heterocyclic group consisting of 3 to 11 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms, (5) an optionally substituted non-aromatic cyclic hydrocarbon group having carbon atoms not greater than 7, and (6) an optionally substituted non-aromatic heterocyclic group having carbon atoms not greater than 7;

Q² represents (1) CH₂, which may optionally be substituted with an optionally substituted C₁₋₄ alkyl group with a substituent selected from the group consisting of carbamoyl group and hydroxyl group, (2) NH, which may optionally be substituted with an optionally substituted C₁₋₄ alkyl group with a substituent selected from the group consisting of carbamoyl group and hydroxyl group, or (3) O;

Y represents a group represented by formula: -CONH-, -CSNH-, -CH₂NH-, -NHCO-, -CH₂O-, -CH₂S-, -COO-, -CSO- or -CH₂CH₂-, which may optionally be substituted with a C₁₋₆ alkyl group; and,

Z⁹ represents hydrogen atom, O or S; and,

P and P′, which may be the same or different, each may form a ring by combining P and P′ or P and Q¹ together and represents:

(1) hydrogen atom;

(2) an optional amino acid residue continuously or discontinuously bound from the C terminus of the 1-48 amino acid sequence in the amino acid sequence represented by SEQ ID NO: 1;

(3) a group represented by formula: J¹-J²-C(J³)(Q³)Y¹C(J⁴)(Q⁴)Y²C(J⁵)(Q⁵)Y³C(J⁶)(Q⁶)C(═Z¹⁰)— (wherein:

J¹ represents (a) hydrogen atom or (b) (i) a C₁₋₁₅ acyl group, (ii) a C₁₋₁₅ alkyl group, (iii) a C₆₋₁₄ aryl group, (iv) carbamoyl group, (v) carboxyl group, (vi) sulfino group, (vii) amidino group, (viii) glyoxyloyl group or (ix) amino group, which groups may optionally be substituted with a substituent containing an optionally substituted cyclic group;

J² represents (1) NH optionally substituted with a C₁₋₆ alkyl group, (2) CH₂ optionally substituted with a C₁₋₆ alkyl group, (3) O or (4) S;

J³ through J⁶ each represents hydrogen atom or a C₁₋₃ alkyl group;

Q³ through Q⁶ each represents a C₁₋₄ alkyl group, which may optionally have a substituent selected from the group consisting of:

(1) an optionally substituted C₆₋₁₂ aromatic hydrocarbon group,

(2) an optionally substituted 5- to 14-membered aromatic heterocyclic group consisting of 1 to 7 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms,

(3) an optionally substituted C₈₋₁₄ aromatic fused-ring group,

(4) an optionally substituted 5- to 14-membered aromatic fused heterocyclic group consisting of 3 to 11 carbon atoms and hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur atoms,

(5) an optionally substituted non-aromatic cyclic hydrocarbon group having carbon atoms not greater than 7,

(6) an optionally substituted non-aromatic cyclic hydrocarbon group having carbon atoms not greater than 7,

(7) an optionally substituted amino group,

(8) an optionally substituted guanidino group,

(9) an optionally substituted hydroxyl group,

(10) an optionally substituted carboxyl group,

(11) an optionally substituted carbamoyl group, and

(12) an optionally substituted sulfhydryl group, or hydrogen atom;

J³ and Q³, J⁴ and Q⁴, J⁵ and Q⁵ or J⁶ and Q⁶ may be combined together, or, J² and Q³, Y¹ and Q⁴, Y² and Q⁵, or Y³ and Q⁶ may be combined together, to form a ring;

Y¹ through Y³ each represents a group represented by formula:

-CON(J¹³)-, -CSN(J¹³)-, -C(J¹⁴)N(J¹³)- or -N(J¹³)CO- (wherein J¹³ and J¹⁴ each represents hydrogen atom or a C₁₋₃ alkyl group); and,

Z¹⁰ represents hydrogen atom, O or S);

(4) a group represented by formula: J¹-J²-C(J⁷)(Q⁷)Y²C(J⁸)(Q⁸)Y³C(J⁹)(Q⁹)C(═Z¹⁰)— (wherein:

J¹ and J², each has the same significance as defined above;

J⁷ through J⁹ have the same significance as for J³;

Q⁷ through Q⁹ have the same significance as for Q³;

Y² and Y³ each has the same significance as defined above;

Z¹⁰ has the same significance as defined above;

J⁷ and Q⁷, J⁸ and Q⁸ or J⁹ and Q⁹ may be combined together, or, J² and Q⁷, Y² and Q⁸ or Y³ and Q⁹ may be combined together, to form a ring);

(5) a group represented by formula: J¹-J²-C(J¹⁰)(Q¹⁰)Y³C(J¹¹)(Q¹¹)C(═Z¹⁰)— (wherein:

J¹ and J² have the same significance as defined above represents;

J¹⁰ and J¹¹ have the same significance as for J³;

Q¹⁰ and Q¹¹ have the same significance as for Q³;

Y³ has the same significance as defined above;

Z¹⁰ has the same significance as defined above; and,

J¹⁰ and Q¹⁰ or J¹¹ and Q¹¹ may be combined together, or J² and Q¹⁰ or Y³ and Q¹¹ may be combined together, to form a ring);

(6) a group represented by formula: J¹-J²-C(J¹²)(Q¹²)C(═Z¹⁰)— (wherein;

J¹ and J² have the same significance as defined above;

J¹² has the same significance as for J³;

Q¹² has the same significance as for Q³;

Z¹⁰ has the same significance as defined above; and,

J¹² and Q¹² may be combined together, or J² and Q¹² may be combined together, to form a ring); or,

(7) a group represented by formula: J¹-

(wherein:

J¹ has the same significance as defined above)], preferably the following compounds:

(Compound No. 305) D-Tyr-D-Pya(4)-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)-Phe- NH₂, (Compound No. 385) D-Tyr-D-Pya(4)-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 501) D-Tyr-D-Pya(4)-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 509) Benzoyl-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)-Trp-NH₂, (Compound No. 512) D-Tyr-D-Trp-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp-NH₂, (Compound No. 516) Ac-D-Tyr-D-Pya(4)-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)- Phe-NH₂, (Compound No. 540) D-Tyr-D-Trp-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)-Trp-NH₂, (Compound No. 541) D-Arg-Acp-D-Tyr-D-Trp-Asn-Phe-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 545) Benzoyl-Asn-Ser-Phe(4F)-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 548) D-Tyr-D-Pya(4)-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)-PheΨ (CSNH)NH2 (Compound No. 550) Ac-D-Tyr-D-Trp-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 551) Ac-D-Arg-Acp-D-Tyr-D-Trp-Asn-Thr-Phe-AzaGly-Leu- Arg(Me)-Trp-NH₂, (Compound No. 552) D-Dap-Acp-D-Tyr-D-Trp-Asn-Thr-Phe-AzaGly-Leu-Arg (Me)-Trp-NH₂, (Compound No. 553) D-Nle-Acp-D-Tyr-D-Trp-Asn-Thr-Phe-AzaGly-Leu-Arg (Me)-Trp-NH₂, (Compound No. 555) D-Arg-γ-Abu-D-Tyr-D-Trp-Asn-Thr-Phe-AzaGly-Leu- Arg(Me)-Trp-NH₂, (Compound No. 558) Ac-D-Tyr-D-Trp-Asn-Ser-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 559) 3-(4-HydroxyPhenyl)propionyl-D-Trp-Asn-Thr-Phe- AzaGly-Leu-Arg(Me)-Trp-NH₂, (Compound No. 562) Ac-D-Tyr-D-Pya(4)-Asn-Th-Phe-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 564) Ac-D-Tyr-D-Trp-Asn-Val-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 566) Cyclopropanecarbonyl-D-Tyr-D-Trp-Asn-Thr-Phe- AzaGly-Leu-Arg(Me)-Trp-NH₂, (Compound No. 567) Butyryl-D-Tyr-D-Trp-Asn-Thr-Phe-AzaGly-Leu-Arg (Me)-Trp-NH₂, (Compound No. 571) Ac-D-Tyr-D-Trp-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Phe- NH₂, (Compound No. 579) Ac-D-Tyr-D-Trp-Alb-Ser-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 580) Ac-D-Tyr-D-Trp-Asn-Ser(Me)-Phe-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 584) Ac-D-Tyr-D-Trp-Dap(Ac)-Ser-Phe-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 585) Ac-D-Tyr-D-Trp-Dap(For)-Ser-Phe-AzaG1y-Leu-Arg(Me)- Trp-NH₂, (Compound No. 589) Ac-D-Tyr-D-Trp-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)- Nal(2)-NH₂, (Compound No. 590) Ac-D-Tyr-D-Trp-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Thi- NH₂, (Compound No. 591) Ac-D-Tyr-D-Trp-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Tyr- NH₂, (Compound No. 592) Ac-D-Tyr-D-Trp-Asn-Thr-Phe-MaGly-Leu-Arg(Me)-Phe (4F)-NH₂, (Compound No. 599) Ac-D-Tyr-D-Trp-Asn-Thr-Phe-AzaGly-Leu-Orn-Trp-NH₂, (Compound No. 600) Ac-D-Tyr-D-Trp-Asn-Thr-Phe-AzaGly-Leu-Arg-Trp-NH₂, (Compound No. 602) Ac-D-NMeTyr-D-Trp-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 608) Ac-D-Tyr-D-Trp-Asn-Thr-Phe-AzaGly-Leu-Arg(symMe2)- Trp-NH₂, (Compound No. 612) For-D-Tyr-D-Trp-Asn-Thr-Phe-AzaG1y-Leu-Arg(Me)- Trp-NH₂, (Compound No. 613) Propionyl-D-Tyr-D-Trp-Asn-Thr-Phe-AzaGly-Leu-Arg (Me)-Trp-NH₂, (Compound No. 615) Ac-Tyr-D-Trp-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 616) Ac-D-Ala-D-Trp-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 617) Ac-D-Leu-D-Trp-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 618) Ac-D-Phe-D-Trp-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 621) Ac-D-Lys-D-Trp-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 623) Ac-D-Tyr-Trp-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 625) Ac-D-Tyr-D-Ala-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 626) Ac-D-Tyr-D-Leu-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 627) Ac-D-Tyr-D-Phe-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 629) Ac-D-Tyr-D-Lys-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 630) Ac-D-Tyr-D-Glu-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 635) Ac-D-Tyr-D-Trp-Asn-Thr-Pya(4)-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 637) Ac-D-Tyr-D-Trp-Asn-Thr-Phe(4F)-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 638) Ac-D-Tyr-D-Pya(4)-Asn-Thr-Phe(4F)-AzaGly-Leu-Arg (Me)-Trp-NH₂, (Compound No. 642) Ac-D-Tyr-D-Trp-Asn-Thr-Phe-AzaGly-Val-Arg(Me)-Trp- NH₂, (Compound No. 648) Gly-D-Tyr-D-Trp-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 649) Ac-Gly-D-Tyr-D-Trp-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 650) D-Tyr-D-Tyr-D-Trp-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 651) Ac-D-Tyr-D-Tyr-D-Trp-Asn-Thr-Phe-AzaGly-Leu-Arg (Me)-Trp-NH₂, (Compound No. 652) pGlu-D-Tyr-D-Trp-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 657) Ac-D-Tyr-Pro-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 658) Ac-D-Tyr-D-Pya(2)-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 660) Ac-D-Tyr-D-Pya(3)-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 662) Ac-D-Tyr-Tic-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp-NH₂, (Compound No. 663) Ac-D-Trp-D-Trp-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 666) Ac-D-Trp-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp-NH₂, (Compound No. 667) Hexanoyl-D-Trp-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 670) 3-Pyridinepropionyl-D-Trp-Asn-Thr-Phe-AzaGly-Leu- Arg(Me)-Trp-NH₂, (Compound No. 671) Adipoyl-D-Trp-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 672) Ac-D-Tyr-NMeTrp-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 674) 6-Aminocaproyl-D-Trp-Asn-Thr-Phe-AzaGly-Leu-Arg (Me)-Trp-NH₂,or salts thereof and

Compounds described in WO 2007/072997 (the metastin derivatives represented by, e.g., the formula below, or salts thereof:

A metastin derivative represented by formula: XX0-XX2-XX3-XX4-XX5-XX6-AzaGly-XX8-XX9-XX10-NH₂ (wherein:

XX0 represents formyl, C₁₋₂₀ alkanoyl, cyclopropanecarbonyl, 6-(acetyl-D-arginylamino)caproyl, 6-((R)-2,3-diaminopropionylamino)caproyl, 6-(D-norleucylamino)caproyl, 4-(D-arginylamino)butyryl, 3-(4-hydroxyphenyl)propionyl, glycyl, tyrosyl, acetylglycyl, acetyltyrosyl, D-tyrosyl, acetyl-D-tyrosyl, pyroglutamyl, 3-(pyridin-3-yl)propionyl, adipoyl, glycoloyl, 6-aminocaproyl;

XX2 represents Tyr, D-Tyr, D-Ala, D-Leu, D-Phe, D-Lys, D-Trp or a chemical bond;

XX3 represents:

D-Asp,D-Dap,D-Ser,D-Gln,D-His,D-NMeAla,D-NMePhe,Aze(2),Pic(2),Pic(3),Hyp,Th z,NMeAla,Gly,Aib,Abz(2),Abz(3),Sar,Leu,Lys,Glu, β-alanine, Pzc(2), Orn,His(3Me), Tyr(PO₃H₂), Pro(4NH₂) or Hyp(Bzl);

XX4 represents Asn, 2-amino-3-ureidopropionic acid, N^(β)-formyl-β-diaminopropionic acid, N^(β)-acetyl-β-diaminopropionic acid, N^(ω)-pentylasparagine, N^(ω)-cyclopropylasparagine, N^(ω)-benzylasparagine, 2,4-diaminobutanoic acid, His, Gln, Cit or a chemical bond;

XX5 represents Ser, Thr, Val, NMeSer, Gly, Ala, Hyp, D-Ala, D-Thr, D-Pro or a chemical bond;

XX6 represents Phe, Tyr, Trp, Tyr(Me), Thi, Nal(2), Cha, Pya(4), threo-Ser(3Phenyl), erythro-Ser(3Phenyl), or optionally substituted phenylalanine;

AzaGly represents azaglycine;

XX8 represents Leu, Nva or Val;

XX9 represents Arg, Orn, Arg(Me) or Arg(asymMe₂); and,

XX10 represents Phe, Trp, 2-naphthylalanine, 2-thienylalanine, tyrosine or 4-fluorophenylalanine); or a salt thereof, preferably, the compounds below or salts thereof:

(Compound No. 708) Ac-D-Tyr-D-Trp-Asn-Thr-Phe-AzaGly-Leu-D-Arg-Trp- NH₂, (Compound No. 709) Ac-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp-NH₂, (Compound No. 710) Decanoyl-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp-NH₂, (Compound No. 712) Acp-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp-NH₂, (Compound No. 713) Ac-Acp-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp-NH₂, (Compound No. 714) Ac-D-Tyr-D-Trp-Asp(NHPen)-Thr-Phe-AzaGly-Leu-Arg (Me)-Trp-NH₂, (Compound No. 715) Ac-D-Tyr-D-Trp-Asp(NHcPr)-Thr-Phe-AzaGly-Leu-Arg (Me)-Trp-NH₂, (Compound No. 716) Ac-D-Tyr-D-Trp-Asp(NHBzl)-Thr-Phe-AzaGly-Leu-Arg (Me)-Trp-NH₂, (Compound No. 717) Ac-D-Tyr-D-Trp-Alb-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 718) Ac-D-Tyr-D-Pya(4)-Alb-Thr-Phe-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 719) Ac-D-Tyr-D-Trp-Asn-D-Pro-Phe-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 720) Ac-D-Tyr-Aze(2)-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 721) Ac-D-Tyr-Pic(2)-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 722) Ac-D-Tyr-Pic(3)-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)- Trp-NH₂ (Compound No. 723) Ac-D-Tyr-Hyp-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 724) Ac-D-Tyr-Thz-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 725) Ac-D-Tyr-NMeAla-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)- Trp-NH₂ (Compound No. 726) Ac-D-Tyr-Gly-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂ (Compound No. 727) Ac-D-Tyr-Aib-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 728) Ac-D-Tyr-Abz(2)-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)- Trp-NH₂ (Compound No. 730) Ac-D-Tyr-Aze(3)-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)- Trp-NH₂ (Compound No. 731) Ac-D-Tyr-Sar-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂ (Compound No. 732) Ac-D-Tyr-D-NMeAla-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 734) Ac-D-Tyr-Izc-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 735) Ac-D-Tyr-D-Asp-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 736) Ac-D-Tyr-D-Dap-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 737) Ac-D-Tyr-D-Ser-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 738) Ac-D-Tyr-D-Gln-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 739) Ac-D-Tyr-D-His-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 740) Ac-D-Tyr-D-Trp-Dab-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 742) Ac-D-Tyr-Ala-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 743) Ac-D-Tyr-Leu-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 744) Ac-D-Tyr-Ser-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 745) Ac-D-Tyr-Lys-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 746) Ac-D-Tyr-Glu-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 747) Ac-D-Tyr-β-Ala-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 748) Ac-D-Tyr-D-Trp-Asn-Thr-Phe(4Cl)-AzaGly-Leu-Arg (Me)-Trp-NH₂, (Compound No. 749) Ac-D-Tyr-D-Trp-Asn-Thr-Phe(2F)-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 750) Ac-D-Tyr-D-Trp-Asn-Thr-Phe(3F)-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 754) Ac-D-Tyr-Lys-Asn-Thr-Phe(2F)-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 755) Ac-D-Tyr-Glu-Asn-Thr-Phe(2F)-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 756) Ac-D-Tyr-Lys-Asn-Thr-Phe(3F)-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 757) Ac-D-Tyr-Glu-Asn-Thr-Phe(3F)-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 758) Ac-D-Tyr-Lys-Asn-Thr-Phe(4Cl)-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 759) Ac-D-Tyr-Glu-Asn-Thr-Phe(4Cl)-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 760) Ac-D-Tyr-Pzc(2)-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 763) Ac-D-Tyr-Hyp-Asn-Thr-Phe(2F)-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 764) Ac-D-Tyr-Trp-Asn-Thr-Phe(2F)-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 765) Ac-D-Tyr-Hyp-Asn-Thr-Phe(3F)-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 766) Ac-D-Tyr-Trp-Asn-Thr-Phe(3F)-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 767) Ac-D-Tyr-Hyp-Asn-Thr-Phe(4Cl)-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 768) Ac-D-Tyr-Trp-Asn-Thr-Phe(4Cl)-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 769) Ac-D-Tyr-Gly-Asn-Thr-Phe(4Cl)-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 770) Ac-D-Tyr-Aib-Asn-Thr-Phe(4Cl)-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 771) Ac-D-Tyr-Orn-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 772) Ac-D-Tyr-Thr-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 773) Ac-D-Tyr-His(3Me)-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 774) Ac-D-Tyr-DL-Ala(Pip)-Asn-Thr-Phe-AzaGly-Leu-Arg (Me)-Trp-NH₂, (Compound No. 775) Ac-D-Tyr-Tyr(PO₃H2)-Asn-Thr-Phe-AzaGly-Leu-Arg (Me)-Trp-NH₂, (Compound No. 776) Glycoloyl-D-Tyr-Hyp-Asn-Thr-Phe-AzaGly-Leu-Arg (Me)-Trp-NH₂ (Compound No. 777) Ac-D-Tyr-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp-NH₂, (Compound No. 780) Ac-D-Tyr-Pro(4NH₂)-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 781) Ac-D-Tyr-Hyp(Bzl)-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 782) Ac-D-Tyr-D-NMePhe-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 783) Ac-D-Tyr-Gly-Asn-Thr-Phe(2F)-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 784) Ac-D-Tyr-Aib-Asn-Thr-Phe(2F)-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 785) Ac-D-Tyr-Gly-Asn-Thr-Phe(3F)-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 786) Ac-D-Tyr-Aib-Asn-Thr-Phe(3F)-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 787) Ac-D-Tyr-Hyp-Asn-Thr-Phe(4F)-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 788) Ac-D-Tyr-Glu-Asn-Thr-Phe(4F)-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 789) Ac-D-Tyr-Lys-Asn-Thr-Phe(4F)-AzaG1y-Leu-Arg(Me)- Trp-NH₂, (Compound No. 790) Ac-D-Tyr-Gly-Asn-Thr-Phe(4F)-AzaGly-Leu-A-g(Me)- Trp-NH₂, (Compound No. 791) Ac-D-Tyr-Aib-Asn-Thr-Phe(4F)-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 794) Ac-D-Tyr-Hyp-Asn-Thr-D-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 797) Ac-D-Tyr-Hyp-Asn-Thr-Phe-AzaGly-Leu-Arg-Trp-NH₂, (Compound No. 800) Ac-D-Tyr-Hyp-Alb-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 801) 4-[Bis-(2-Pyridylmethyl)aminomethyl]benzoyl-Phe- AzaGly-Leu-Arg(Me)-Trp-NH₂, (Compound No. 809) Ac-D-Tyr-Hyp-Asn-NMeSer-Phe-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 810) Ac-D-Tyr-Hyp-Asn-Hyp-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 813) Ac-D-Tyr-Hyp-Asn-Gly-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 814) Ac-D-Tyr-Hyp-Asn-Ala-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 815) Ac-D-Tyr-Hyp-Asn-D-Ala-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 816) Ac-D-Tyr-Hyp-His-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 843) Ac-D-Tyr-Hyp-Gln-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 844) Ac-D-Tyr-Hyp-D-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 845) Ac-D-Tyr-Hyp-Cit-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 846) Ac-D-Tyr-Hyp-Asn-D-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 856) Ac-D-Tyr-Hyp-Asn-Thr-Phe-AzaGly-Ala(cPr)-Arg(Me)- Trp-NH₂, (Compound No. 860) 4-Ureidobenzoyl-Phe-AzaGly-Leu-Arg(Me)-Trp-NH₂, (Compound No. 861) Ac-D-Tyr-Hyp-Arg-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 862) Ac-D-Tyr-Hyp-Gly-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 863) Ac-D-Tyr-Hyp-Dap-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 864) Ac-D-Tyr-Hyp-Dab-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 868) Ac-D-Tyr-Hyp-Asn-Thr-αMePhe-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 870) Ac-D-Tyr-Hyp-Asn-Thr-Phe(2Me)-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 872) Ac-D-Tyr-Hyp-Asn-Thr-Phe(3Me)-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 874) Ac-D-Tyr-Hyp-Asn-Thr-Phe(4Me)-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 877) Ac-D-Tyr-Hyp-Asn-Thr-threo-Ser(3Phenyl)-AzaGly- Leu-Arg(Me)-Trp-NH₂ (Compound No. 882) Ac-D-Tyr-Hyp-Asn-Thr-erythro-Ser(3Phenyl)-AzaGly- Leu-Arg(Me)-Trp-NH₂ (Compound No. 886) Ac-D-Tyr-Hyp-Nva-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp- NH₂, (Compound No. 887) Ac-Hyp-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp-NH₂, (Compound No. 888) 3-(p-Hydroxyphenyl)propionyl-Hyp-Asn-Thr-Phe- AzaGly-Leu-Arg(Me)-Trp-NH₂, (Compound No. 889) pGlu-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp-NH₂, (Compound No. 896) Ac-D-Tyr-cisHyp-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 897) Ac-D-Tyr-Pro(4F)-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)- Trp-NH₂, (Compound No. 899) Ac-Tyr-Hyp-Asn-Thr-Phe-AzaGly-Leu-Arg(Me)-Trp-NH₂ are also useful as agents for preventing/treating rheumatic diseases (e.g., rheumatoid arthritis, osteoarthritis, gout, etc.) or the like. Tests can be performed by the publicly known procedures described above to determine that these compounds are useful for rheumatic diseases.

These compounds are also useful as an agent for preventing/treating autism, immunomodulation (regeneration of thymus, repopulation of thymus, enhanced T cell growth), diabetic neuropathy, diabetic nephropathy, diabetic retinopathy, arteriosclerosis, thrombotic disorders or lipotoxicity; an agent for preventing/treating hyperlipemia, type II diabetes mellitus, hypertension, diabetic neuropathy, diabetic nephropathy or diabetic retinopathy; an antianxiety agent; an antistress agent; an anti-insomnia agent; an antimanic-depressive agent; an agent for preventing/treating hypertension (e.g., essential hypertension, renal hypertension, salt sensitive hypertension, etc.), angina pectoris (e.g., stable angina, unstable angina, etc.), myocardial infarction, cerebrovascular disorders (e.g., asymptomatic cerebrovascular disorder, transient ischemic attack, apoplexy, cerebrovascular dementia, hypertensive encephalopathy, cerebral infarction, etc.), venous insufficiency, obliterative peripheral circulatory disturbances, Raynaud's disease, arteriosclerosis including atherosclerosis (e.g., aneurysm, coronary arteriosclerosis, cerebral arteriosclerosis, peripheral arteriosclerosis, etc.), vascular thickening or occlusion and organ impairments after intervention (e.g., percutaneous coronary intervention, stent placement, coronary thrombolytic therapy, etc.), portal hypertension, respiratory disorders (e.g., asthma, pulmonary hypertension, etc.); an agent for preventing/treating impaired glucose tolerance (IGT); an insulin secretagogue, an inhibitor for transition from IGT to diabetes;

an agent for preventing/treating diabetic complications [e.g., neuropathy, nephropathy, retinopathy, cataract, macroangiopathy, osteopenia, hyperosmolar diabetic coma, infectious diseases (e.g., respiratory infection, urinary tract infection, digestive tract infection, skin soft-tissue infection, lower leg infection), diabetic gangrene, xerostomia, hypacusis, cerebrovascular disorder, peripheral circulatory disturbance], osteoporosis, cachexia (e.g., cancerous cachexia, tuberculous cachexia, diabetic cachexia, blood disease cachexia, endocrine disease cachexia, infectious disease cachexia or cachexia due to acquired immunodeficiency syndrome), fatty liver, polycystic ovary syndrome, renal diseases (e.g., diabetic nephropathy, glomerulonephritis, glomerulosclerosis, nephrotic syndrome, hypertensive nephrosclerosis, end stage kidney disease), muscular dystrophy, cardiac infarction, angina pectoris, cerebrovascular disorders (e.g., cerebral infarction, apoplexy), Alzheimer's disease, Parkinson's disease, dementia, insulin resistance syndrome, Syndrome X, metabolic syndrome, hyperinsulinemia, hyperinsulinemia-induced sensory disorders, tumors (e.g., leukemia, skin cancer), irritable bowel syndrome, acute or chronic diarrhea, inflammatory diseases (e.g., deforming spondylitis, arthritis deformans, lumbago, gout, postoperative or posttraumatic inflammation, swelling, neuralgia, pharyngolaryngitis, cystitis, hepatitis (including nonalcoholic steatohepatitis), pneumonia, enteritis, inflammatory bowel disorder (including inflammatory bowel diseases), ulcerative colitis, gastric mucosa damage (including gastric mucosa damage induced by aspirin)), damages of small intestinal mucosa, malabsorption, testicular function disorder, visceral obesity syndrome, etc.; and,

for reduction of visceral adiposity, inhibition of visceral fat accumulation, improvement of glucose metabolism, improvement of lipid metabolism, suppression of oxidized LDL production, improvement of lipoprotein metabolism, improvement of coronary artery metabolism, prevention or treatment of cardiovascular complication, prevention or treatment of heart failure complications, decrease in blood remnant, prevention or treatment of anovulation, prevention or treatment of hirsutism or prevention or treatment of hyperandrogenemia; as an agent for improving pancreas (β cells) function, a regenerative agent for pancreas (β cells), an agent for stimulating pancreatic (β cell) regeneration, an appetite regulator, etc.

These compounds can be used in combination with drugs other than the said compounds.

As drugs, which can be used in combination with these compounds (hereinafter sometimes simply referred to as concomitant drugs), the medicaments described as drugs which can be used in combination with the compounds of the present invention can be used in a similar manner.

The compounds of the present invention can be used in combination with drugs, e.g., chemotherapeutic agents for treating cancer, hormonal therapeutic agents, immunotherapeutic agents, drugs for inhibiting the actions of cell growth factors and their receptors, etc. (hereinafter simply referred to as concomitant agents). Examples of the “chemotherapeutic agents” include alkylating agents, antimetabolites, anticancer antibiotics, anticancer agents derived from plants, etc. Specifically, the drugs described later can be used.

Furthermore, the compound of the present invention has excellent blood stability, solubility and solution stability, as compared to native metastin such as metastin 54 (1-54) or metastin 10 (45-54).

The metastin derivative of the present invention or its salt or prodrug, metastin per se, or DNA encoding metastin, etc. is useful as an agent for suppressing gonadotropic hormone (e.g., FSH, LH) secretion or sex hormone [e.g., androgen (e.g., testosterone, androstenedione), estrogen (e.g., estradiol, estrone), progesterone] secretion; etc.; in particular, it is useful for suppressing gonadotropic hormone secretion or sex hormone secretion via down-regulation of gonadotropic hormone or sex hormone (wherein, the down-regulation of gonadotropic hormone or sex hormone may be pulse loss of LHRH or depletion of LHRH) or down-regulation of human OT7T175 (metastin receptor) protein consisting of the amino acid sequence represented by SEQ ID NO: 9; particularly useful as an agent for preventing or treating hormone-dependent cancers (e.g., prostate cancer, breast cancer, etc.; especially a prostate cancer, hormone-sensitive prostate cancer, etc.); an agent for preventing or treating endometriosis; an agent for inhibiting ovarian follicular maturation; a menstrual cycle-suspending agent; an agent for treating myoma of the uterus; an agent for treating early puberty; or as a contraceptive, etc. Where the metastin derivative of the present invention or its salt or prodrug, metastin per se, or DNA encoding metastin, etc. has normal agonist activity, an effective dose of the metastin derivative sufficient to suppress the secretion of gonadotropic hormone or sex hormone is administered at the site or tissue where the therapeutic effects are to be exerted, so that the metastin derivative is present in a dose more than required (i.e., the metastin derivative is administered in an excess over the normal effective dose, at which the metastin derivative exerts the effects of suppressing cancer metastasis, suppressing cancer growth, etc.; or the effect of promoting gonadotropic hormone secretion, the effect of promoting sex hormone secretion, etc.) to exhibit the effects of suppressing gonadotropic hormone secretion or sex hormone secretion. Specific examples include sustained or continuous administration of the normal effective dose (including an administration technique to gradually release the pharmaceutical ingredients by bolus administration); and the like. Further when the metastin derivative of the present invention or its salt or the prodrug thereof, etc. has a sufficient agonist activity more than required (a super-agonist activity), it becomes possible to sustain the activities more than exhibited by the necessary dose at the site or tissue where the therapeutic effect are to be exhibited. It is therefore sufficient even by normal effective dose administration to suppress the secretion of gonadotropic hormone or sex hormone, whereby the effect of suppressing gonadotropic hormone secretion or sex hormone secretion is exhibited.

In other words, an effective dose of the metastin derivative of the present invention or its salt or prodrug, metastin per se, or DNA encoding metastin, etc. sufficient to suppress the secretion of gonadotropic hormone or sex hormone is administered so that the metastin derivative is present in a dose more than required at the site or tissue where the therapeutic effects are to be exerted, or its activities can be sustained more than required, which enables to exhibit the effects of suppressing gonadotropic hormone secretion or suppressing sex hormone secretion.

The medicament comprising the compound of the present invention is low toxic. Therefore, the compound of the present invention can be safely administered either directly as it is or as a mixture with pharmacologically acceptable carriers, orally or parenterally (e.g., topically, rectally, intravenously, etc.), in the form of pharmaceutical preparations such as tablets (including dragees and film-coated tablets), powdery dosage forms, granules, capsules (including soft capsules), liquid dosage forms, injections, suppositories, sustained release dosage forms, etc., in accordance with publicly known means generally used in process for producing pharmaceutical preparations.

The compound of the present invention is contained in the pharmaceutical preparation of the present invention in about 0.01 to about 100 wt %, based on the total weight of the preparation.

A dose of the compound of the present invention may vary depending upon subject to be administered, target organ, conditions, route of administration, etc., and in oral administration, the compound is generally administered to the patient (as 60 kg body weight) with cancer in a daily dose of about 0.01 to about 100 mg, preferably about 0.1 to about 50 mg and more preferably about 0.1 to about 20 mg. In parenteral administration, a single dose of the compound may vary depending upon subject to be administered, target organ, conditions, route of administration, etc., and in the form of an injectable dosage form, it is advantageous to administer the compound to the patient (as 60 kg body weight) with cancer generally in a daily dose of about 0.001 to about 30 mg, preferably about 0.01 to about 20 mg, and more preferably about 0.01 to about 10 mg. For other animal species, the corresponding dose as converted per 60 kg weight can be administered.

Pharmacologically acceptable carriers, which may be used in manufacturing the pharmaceutical preparation of the present invention, include various organic or inorganic carrier substances conventionally used as materials for pharmaceutical preparations. These substances include, e.g., an excipient, a lubricant, a binder and a disintegrating agent in a solid dosage form, and a solvent, a dissolution aid, a suspending agent, an isotonizing agent, a buffer, a soothing agent, etc. in a liquid dosage form. In addition, conventional additives such as a preservative, an antioxidant, a colorant, a sweetener, an adsorbent, a wetting agent, etc. can be appropriately used in suitable amounts, if necessary. Examples of excipients include lactose, saccharose, D-mannitol, starch, cornstarch, crystalline cellulose, light anhydrous silicic acid, etc. Examples of lubricants include magnesium stearate, calcium stearate, talc, colloidal silica, etc.

Examples of binders include crystalline cellulose, saccharose, D-mannitol, dextrin, hydroxypropylcellulose, hydroxypropylmethylcellulose, polyvinylpyrrolidone, starch, sucrose, gelatin, methylcellulose, sodium carboxymethylcellulose, etc.

Examples of disintegrating agents include starch, carboxymethylcellulose, carboxymethylcellulose calcium, sodium carboxymethyl starch, L-hydroxypropylcellulose, etc.

Examples of solvents include water for injection, alcohol, propylene glycol, Macrogol, sesame oil, corn oil, olive oil, etc.

Examples of dissolution aids include polyethylene glycol, propylene glycol, D-mannitol, benzyl benzoate, ethanol, trisaminomethane, cholesterol, triethanolamine, sodium carbonate, sodium citrate, etc.

Examples of suspending agents include surfactants such as stearyl triethanolamine, sodium lauryl sulfate, lauryl aminopropionate, lecithin, benzalkonium chloride, benzethonium chloride, glycerin monostearate, etc.; hydrophilic polymers such as polyvinyl alcohol, polyvinyl pyrrolidone, sodium carboxymethylcellulose, methylcellulose, hydroxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, etc.

Examples of isotonizing agents include glucose, D-sorbitol, sodium chloride, glycerin, D-mannitol, etc.

Examples of buffers include buffering solutions of a phosphate, acetate, carbonate, citrate, etc.

Examples of soothing agents include benzyl alcohol, etc.

Examples of preservatives include p-hydroxybenzoates, chlorobutanol, benzyl alcohol, phenethyl alcohol, dehydroacetic acid, sorbic acid, etc.

Examples of antioxidants include a sulfite, ascorbic acid, α-tocopherol, etc.

Furthermore, the compound of the present invention can be used in combination with drugs other than the compound of the present invention.

Examples of the drugs, which can be used in combination with the compound of the present invention (hereinafter sometimes simply referred to as concomitant drugs), include chemotherapeutic agents for treating cancer, hormonal therapeutic agents, immunotherapeutic agents, drugs for inhibiting the actions of cell growth factors and their receptors, etc. (hereinafter simply referred to as concomitant agents).

Examples of “chemotherapeutic agents” include alkylating agents, antimetabolites, anticancer antibiotics, anticancer agents derived from plants, etc.

Examples of “alkylating agents” include nitrogen mustard, nitrogen mustard-N-oxide hydrochloride, chlorambutyl, cyclophosphamide, ifosfamide, thiotepa, carboquone, improsulfan tosylate, busulfan, nimustine hydrochloride, mitobronitol, rnelphalan, dacarbazine, ranimustine, estramustine sodium phosphate, triethylenemelamine, carmustine, lomustine, streptozocin, pipobroman, etoglucid, carboplatin, cisplatin, miboplatin, nedaplatin, oxaliplatin, altretamine, ambamustine, dibrospidium hydrochloride, fotemustine, prednimustine, pumitepa, ribomustin, temozolomide, treosulphan, trophosphamide, zinostatin stimalamer, carboquone, adozelesin, cystemustine, bizelesin, etc.

Examples of “antimetabolites” include mercaptopurine, 6-mercaptopurine riboside, thioinosine, methotrexate, enocitabine, cytarabine, cytarabine ocfosfate, ancitabine hydrochloride, 5-FU drugs (e.g., fluorouracil, tegafur, UFT, doxifluridine, carmofur, gallocitabine, emmitefur, etc.), aminopterin, leucovorin calcium, tabloid, butocine, folinate calcium, levofolinate calcium, cladribine, emitefur, fludarabine, gemcitabine, hydroxycarbamide, pentostatin, piritrexim, idoxuridine, mitoguazone, thiazophrine, ambamustine, etc.

Examples of “anticancer antibiotics” include actinomycin D, actinomycin C, mitomycin C, chromomycin A3, bleomycin hydrochloride, bleomycin sulfate, peplomycin sulfate, daunorubicin hydrochloride, doxorubicin hydrochloride, aclarubicin hydrochloride, pirarubicin hydrochloride, epirubicin hydrochloride, neocarzinostatin, mithramycin, sarcomycin, carzinophilin, mitotane, zorubicin hydrochloride, mitoxantrone hydrochloride, idarubicin hydrochloride, etc.

Examples of “anticancer agents derived from plants” include etoposide, etoposide phosphate, vinblastine sulfate, vincristine sulfate, vindesine sulfate, teniposide, paclitaxel, docetaxel, vinorelbine, etc.

Examples of “hormonal therapeutic agents” include fosfestrol, diethylstylbestrol, chlorotrianisene, medroxyprogesterone acetate, megestrol acetate, chlormadinone acetate, cyproterone acetate, danazol, allylestrenol, gestrinone, mepartricin, raloxifene, ormeloxifene, levormeloxifene, anti-estrogens (e.g., tamoxifen citrate, toremifene citrate, etc.), pill dosage forms, mepitiostane, testrolactone, aminoglutethimide, LH-RH agonists (e.g., goserelin acetate, buserelin, leuprorelin, etc.), droloxifene, epitiostanol, ethinylestradiol sulfonate, aromatase inhibitors (e.g., fadrozole hydrochloride, anastrozole, retrozole, exemestane, vorozole, formestane, etc.), anti-androgens (e.g., flutamide, bicartamide, nilutamide, etc.), 5α-reductase inhibitors (e.g., finasteride, epristeride, etc.), adrenocorticohormone drugs (e.g., dexamethasone, prednisolone, betamethasone, triamcinolone, etc.), androgen synthesis inhibitors (e.g., abiraterone, etc.), retinoid and drugs that retard retinoid metabolism (e.g., liarozole, etc.), and among others, LH-RH agonists (e.g., goserelin acetate, buserelin, leuprorelin, etc.) are preferable.

Examples of “immunotherapeutic agents (BRM)” include picibanil, krestin, sizofuran, lentinan, ubenimex, interferons, interleukins, macrophage colony-stimulating factor, granulocyte colony-stimulating factor, erythropoietin, lymphotoxin, BCG vaccine, Corynebacterium parvum, levamisole, polysaccharide K, procodazole, etc.

The “cell growth factors” in the “drugs for inhibiting the actions of cell growth factors and their receptors” can be any substance so long as it is a material for stimulating the cell growth and, normally, peptides which have a molecular weight of 20,000 or less and bind to their receptors to exhibit the actions in a lower level can be used as the factors. Specific examples are (1) EGF (epidermal growth factor) or substances having substantially the same activity as EGF [e.g., EGF, hereglin, etc.], (2) insulin or substances having substantially the same activity as insulin [e.g., insulin, IGF (insulin-like growth factor)-1, IGF-2, etc.], (3) FGF (fibroblast growth factor) or substances having substantially the same activity as FGF [e.g., acidic FGF, basic FGF, KGF (keratinocyte growth factor), FGF-10, etc.], (4) other cell growth factors [e.g., CSF (colony stimulating factor), EPO (erythropoietin), IL-2 (interleukin-2), NGF (nerve growth factor), PDGF (platelet-derived growth factor), TGFβ (transforming growth factor β), HGF (hepatocyte growth factor), VEGF (vascular endothelial growth factor), etc.] and the like.

The “receptors of the cell growth factors” can be any receptor as long as it is capable of binding to the cell growth factors described above, and specific examples are EGF receptor, hereglin receptor (HER2), insulin receptor, IGF receptor, FGF receptor-1 or FGF receptor-2, etc.

As the “agent inhibiting the effect of cell growth factor” includes HER2 antibody (trastuzumab (Herceptin (trademark)), etc.), imatinib mesylate, ZD1839 or EGFR antibody (cetuximab (Erbitux (trademark)), etc.), antibody against VEGF (e.g., Bevacizumab (Avastin (trademark))), VEGFR antibody, VEGFR inhibitor, EGFR inhibitor (erlotinib (Tarceva (trademark)), gefitinib (Iressa (trademark)), etc.)

In addition to the aforesaid agents, there are also used L-asparginase, aceglatone, procarbazine hydrochloride, protoporphyrin-cobalt complex, mercury-hematoporphyrin sodium, topoisomerase I inhibitor (e.g., Irinotecan, Topotecan, etc.), topoisomerase II inhibitor (e.g., Sobzoxan, etc.), differentiation-inducing agent (e.g., retinoid, vitamin D group, etc.), angiogenesis inhibitor (e.g., thalidomide, SU11248, etc.), α-blocker (e.g., tamsulosin hydrochloride, naftopidil, urapidil, alfuzosin, terazosin, prazosin, silodosin, etc.), serine-threonine kinase inhibitor, endothelin receptor antagonist (e.g., atrasentan, etc.), proteasome inhibitor (e.g., bortezomib, etc.), Hsp90 inhibitor (e.g., 17-AAG, etc.), spironolactone, minoxidil, 11α-hydroxyprogesterone, bone resorption inhibitor/bone metastasis suppressor (e.g., zoledronic acid, alendronic acid, pamidronic acid, etidronic acid, ibandronic acid, clodronic acid), etc.

The combined use of the compound of the present invention and a concomitant drug exhibits the following excellent effects.

(1) The dose can be reduced as compared to the dose when the compound of the present invention or a concomitant drug is administered alone.

(2) A drug concomitantly administered with the compound of the present invention can be chosen depending on the condition (mild, severe, etc.) of a patient.

(3) A concomitant drug, whose functional mechanism is different from that of the compound of the present invention, can be chosen so that a treatment period can be set longer.

(4) A concomitant drug, whose functional mechanism is different from that of the compound of the present invention, can be chosen so that sustained therapeutic effects can be achieved.

(5) A synergistic effect can be obtained by the concomitant use of the compound of the present invention and a concomitant drug.

In addition, the compound of the present invention can reduce values of testosterone to emasculate level immediately after medication. Thus when the concomitant drug such as LH-RH agonist (e.g., goserelin acetate, buserelin, leuprorelin, etc.; preferably leuprorelin) is used in combination with the compound of the present invention, the values of testosterone can be reduced to emasculate level immediately after medication of the compound of the present invention. Further, since the combined use of the concomitant drug such as LH-RH agonist (e.g., goserelin acetate, buserelin, leuprorelin, etc.; preferably leuprorelin) and the compound of the present invention results in prolonged preservation of hormone-dependent period, it can advantageously be used.

Hereinafter, the combined use of the compound of the present invention and the concomitant drug is referred to as “the combined preparation of the present invention.”

When the combined preparation of the present invention is used, a dosing period of the compound of the present invention and the concomitant drug is not restricted; the compound of the present invention or its pharmaceutical composition and the concomitant drug or its pharmaceutical composition may be administered to the subject to be administered either simultaneously or at certain time intervals. The dose of the concomitant drug may be modified according to the dose used clinically and may be appropriately chosen depending upon subject to be administered, route for administration, disease, combination, etc.

A mode for administration of the combined preparation of the present invention is not particularly limited, but it is sufficient that the compound of the present invention is used in combination with the concomitant drug at the time of administration. For such mode of administration, there are, for example, (1) administration of a single dosage form obtained by mixing the compound of the present invention and the concomitant drug together at the same time, (2) simultaneous administration of two dosage forms prepared separately from the compound of the present invention and the concomitant drug through the same route for administration, (3) administration of two dosage forms prepared separately from the compound of the present invention and the concomitant drug at certain time intervals through the same route for administration, (4) simultaneous administration of two dosage forms prepared separately from the compound of the present invention and the concomitant drug through different routes for administration, (5) administration of two dosage forms prepared separately from the compound of the present invention and the concomitant drug at certain time intervals (e.g., administration of the compound of the present invention and the concomitant drug in this order, or administration in a reversed order) through different routes for administration, etc.

The combined preparation of the present invention is low toxic and thus can be safely administered orally or parenterally (e.g., topically, rectally, intravenously, etc.) in the form of pharmaceutical preparations such as tablets (including dragees and film-coated tablets), powdery dosage forms, granules, capsules (including soft capsules), liquid dosage forms, injections, suppositories, sustained release dosage forms, etc., which are obtained by mixing the compound of the present invention or (and) the concomitant drug described above with pharmacologically acceptable carriers by publicly known methods. Injectable dosage forms can be administered intravenously, intramuscularly or subcutaneously, into the organ, or directly at the focus.

Pharmacologically acceptable carriers, which may be used to manufacture the combined preparation of the present invention, include various organic or inorganic carrier substances conventionally used as materials for pharmaceutical preparations. These substances include, e.g., an excipient, a lubricant, a binder and a disintegrating agent in a solid dosage form, and a solvent, a dissolution aid, a suspending agent, an isotonizing agent, a buffer, a soothing agent, etc. in a liquid dosage form. In addition, conventional additives such as a preservative, an antioxidant, a colorant, a sweetener, an adsorbent, a wetting agent, etc. can be appropriately used in suitable amounts, if necessary.

Examples of excipients include lactose, saccharose, D-mannitol, starch, cornstarch, crystalline cellulose, light anhydrous silicic acid, etc.

Examples of lubricants include magnesium stearate, calcium stearate, talc, colloidal silica, etc.

Examples of binders include crystalline cellulose, saccharose, D-mannitol, dextrin, hydroxypropylcellulose, hydroxypropylmethylcellulose, polyvinylpyrrolidone, starch, sucrose, gelatin, methylcellulose, sodium carboxymethylcellulose, etc.

Examples of disintegrating agents include starch, carboxymethylcellulose, carboxymethylcellulose calcium, sodium carboxymethyl starch, L-hydroxypropylcellulose, etc.

Examples of solvents include water for injection, alcohol, propylene glycol, Macrogol, sesame oil, corn oil, olive oil, etc.

Examples of dissolution aids include polyethylene glycol, propylene glycol, D-mannitol, benzyl benzoate, ethanol, trisaminomethane, cholesterol, triethanolamine, sodium carbonate, sodium citrate, etc.

Examples of suspending agents include surfactants such as stearyltriethanolamine, sodium lauryl sulfate, lauryl aminopropionate, lecithin, benzalkonium chloride, benzethonium chloride, glycerin monostearate, etc.; hydrophilic polymers such as polyvinyl alcohol, polyvinyl pyrrolidone, sodium carboxymethylcellulose, methylcellulose, hydroxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, etc.

Examples of isotonizing agents include glucose, D-sorbitol, sodium chloride, glycerin, D-mannitol, etc.

Examples of buffers include buffering solutions of a phosphate, acetate, carbonate, citrate, etc.

Examples of soothing agents include benzyl alcohol, etc.

Examples of preservatives include p-hydroxybenzoates, chlorobutanol, benzyl alcohol, phenethyl alcohol, dehydroacetic acid, sorbic acid, etc.

Examples of antioxidants include a sulfite, ascorbic acid, α-tocopherol, etc.

In the combined preparation of the present invention, a ratio of the compound of the present invention to the concomitant drug can be appropriately chosen depending upon subject to be administered, route for administration, disease, etc.

For example, the amount of the compound of the present invention contained in the combined preparation of the present invention varies depending on the dosage form of the preparation, but is usually about 0.01 to 100% by weight, preferably about 0.1 to 50% by weight, and more preferably about 0.5 to 20% by weight, based on the total weight of the preparation.

The amount of the concomitant drug contained in the combined preparation of the present invention varies depending on the dosage form of the preparation, but is usually about 0.01 to 100% by weight, preferably about 0.1 to 50% by weight, and more preferably about 0.5 to 20% by weight, based on the total weight of the preparation.

The amount of additives such as a carrier, etc. contained in the combined preparation of the present invention varies depending on the dosage form of the preparation, and is usually about 1 to 99.99% by weight, preferably about 10 to 90% by weight, based on the total weight of the preparation.

These amounts may be the same, also when the compound of the present invention and the concomitant drug are separately prepared, respectively.

These preparations can be manufactured by per se publicly known methods conventionally used in general.

For example, the compound of the present invention or the concomitant drug can be prepared into an injectable dosage form by formulating with a dispersing agent (e.g., Tween 80 (manufactured by Atlas Powder Company, USA), HCO 60 (manufactured by Nikko Chemicals Co., Ltd.), polyethylene glycol, carboxymethyl cellulose, sodium alginate, hydroxypropylmethyl cellulose, dextrin, etc.), a stabilizer (e.g., ascorbic acid, sodium pyrosulfite), a surfactant (e.g., polysorbate 80, macrogol, etc.), a solubilizing agent (e.g., glycerin, ethanol, etc.), a buffering agent (e.g., phosphoric acid or its alkali metal salt, citric acid or its alkali metal salt, etc.), an isotonizing agent (e.g., sodium chloride, potassium chloride, mannitol, sorbitol, glucose, etc.), a pH adjusting agent (e.g., hydrochloric acid, sodium hydroxide, etc.), a preservative (e.g., ethyl p-oxybenzoate, benzoic acid, methylparabene, propylparabene, benzyl alcohol, etc.), a solubilizer (e.g., concentrated glycerin, meglumine, etc.), a dissolution aid (e.g., propylene glycol, saccharose, etc.), a soothing agent (e.g., glucose, benzyl alcohol, etc.), to prepare into aqueous injection; or by dissolving, suspending, or emulsifying with a vegetable oil such as olive oil, sesame oil, cottonseed oil, corn oil, etc., a dissolution aid such as propylene glycol or the like to prepare into an oily injection.

An oral dosage form can be produced in a conventional manner by adding to the compound of the present invention or the concomitant drug, for example, an excipient (e.g., lactose, saccharose, starch, etc.), a disintegrating agent (e.g., starch, calcium carbonate, etc.), a binder (e.g., starch, gum arabic, carboxymethyl cellulose, polyvinylpyrrolidone, hydroxypropyl cellulose, etc.), a lubricant (e.g., talc, magnesium stearate, polyethylene glycol 6000, etc.) and other additives, compressing the resulting mixture and, if necessary, coating the compressed product for the purpose of taste masking, enteric degradation or sustained release by techniques per se publicly known. Coating agents for this purpose include, for example, hydroxypropylmethyl cellulose, ethyl cellulose, hydroxymethyl cellulose, hydroxypropyl cellulose, polyoxyethylene glycol, Tween 80, Prulonic F68, cellulose acetate phthalate, hydroxypropylmethyl cellulose phthalate, hydroxymethyl cellulose acetate succinate, Eudragit (manufactured by Rohm Company, Germany, methacrylic acid/acrylic acid copolymer) and dyes (e.g., iron oxide, titanium dioxide). The oral dosage form may be either an immediate release dosage form or a sustained release dosage form.

For example, in a suppository, the compound of the present invention or the concomitant drug is prepared into an oily or aqueous solid, semi-solid or liquid composition by techniques per se publicly known. Oily bases used for the composition described above include glycerides of higher fatty acids [e.g., cacao butter, uitepsols (manufactured by Dynamite Nobel Company, Germany), etc.], moderate fatty acids [e.g., miglyols (manufactured by Dynamite Nobel Company, Germany), etc.], vegetable oils (e.g., sesame oil, soybean oil, cottonseed oil, etc.), and the like. Aqueous bases include, for example, polyethylene glycols and propylene glycol. Bases for aqueous gels include, for example, natural rubbers, cellulose derivatives, vinyl polymers, acrylic polymers, etc.

Examples of the sustained release dosage form above include sustained release microcapsules, and the like.

Sustained release microcapsules can be obtained by per se publicly known methods, and are preferably prepared in the form of, e.g., a sustained release dosage form by the method [2] shown below and administered.

Preferably, the compound of the present invention is prepared into a dosage form for oral administration such as a solid dosage form (e.g., powdery dosage form, granules, tablets, capsules) or into a dosage form for rectal administration such as a suppository, etc. A dosage form for oral administration is particularly preferred.

The concomitant drug can be prepared into the dosage form described above, depending on the kind of drug.

Hereinafter, [1] an injectable preparation of the compound of the present invention or the concomitant drug and its production, [2] a sustained release or immediate release preparation of the compound of the present invention or the concomitant drug and its production and [3] a sublingual, buccal or rapid oral disintegrating preparations of the compound of the present invention or the concomitant drug and its production will be specifically described.

[1] Injectable Preparation and its Production

An injectable preparation obtained by dissolving the compound of the present invention or the concomitant drug in water is preferred. The injectable preparation may contain a benzoate and/or a salicylate.

The injectable preparation is obtained by dissolving the compound of the present invention or the concomitant drug and optionally a benzoate and/or a salicylate in water.

Examples of the benzoate and/or salicylate described above include an alkali metal salt such as sodium and potassium salts, etc., an alkaline earth metal salt such as calcium and magnesium salts, etc., an ammonium salt, a meglumine salt, a salt of an organic acid such as trometamol, and the like.

The concentration of the compound of the present invention or the concomitant drug in the injectable preparation is about 0.05 to 50 w/v %, preferably about 0.3 to 20 w/v %. The concentration of the benzoate and/or salicylate is 0.5 to 50 w/v %, preferably 3 to 20 w/v %.

Furthermore, additives generally used in an injectable preparation such as a stabilizer (ascorbic acid, sodium pyrosulfite, etc.), a surfactant (polysorbate 80, macrogol, etc.), a solubilizing agent (glycerin, ethanol, etc.), a buffering agent (phosphoric acid and its alkali metal salt, citric acid and its alkali metal salt, etc.), an isotonizing agent (sodium chloride, potassium chloride, etc.), a dispersing agent (hydroxypropylmethyl cellulose, dextrin), a pH adjusting agent (hydrochloric acid, sodium hydroxide, etc.), a preservative (ethyl p-oxybenzoate, benzoic acid, etc.), a solubilizer (concentrated glycerin, meglumine, etc.), a dissolution aid (propylene glycol, saccharose, etc.), a soothing agent (glucose, benzyl alcohol, etc.) are appropriately added to the preparation. Any of these additives is added in an amount generally used in an injectable preparation.

The injectable preparation is adjusted to pH of 2 to 12, preferably 2.5 to 8.0 by adding a pH adjusting agent.

The injectable preparation is obtained by dissolving both the compound of the present invention or the concomitant drug and optionally a benzoate and/or salicylate, and, if necessary, the above additives in water. These components may be dissolved in any order according to the same manner as in a conventional injectable preparation.

An aqueous solution for injection is preferably warmed, and used as an injectable preparation after sterilization by filtration or autoclaved as in a conventional injectable preparation to provide for an injectable preparation.

An aqueous injectable preparation is preferably autoclaved, e.g., at 100 to 121° C. for 5 to 30 minutes.

Moreover, the preparation may be in a solution form to which antibacterial activity is imparted to be usable as a multiple dosage form in divided dosing.

[2] Sustained Release or Immediate Release Preparation and its Production

A preferred sustained release preparation comprises a core comprising the compound of the present invention or the concomitant drug, which is optionally coated with a water-insoluble material or a swelling polymer. For example, a sustained release preparation for oral administration of a once-daily dosage form is preferred.

Examples of the water-insoluble material used for the coating agent include cellulose ethers such as ethyl cellulose, butyl cellulose, etc., cellulose esters such as cellulose acetate, cellulose propionate, etc., polyvinyl esters such as polyvinyl acetate, polyvinyl butyrate, etc., acrylic acid polymers such as an acrylic acid/methacrylic acid copolymer, a methyl methacrylate copolymer, an ethoxyethyl methacrylate/cinnamoethyl methacrylate/aminoalkyl methacrylate copolymer, a polyacrylic acid, a polymethacrylic acid, a methacrylic acid alkylamide copolymer, a poly(methyl methacrylate), a polymethacrylate, an aminoalkyl methacrylate copolymer, a poly(methacrylic anhydride), a glycidyl methacrylate copolymer, in particular, a series of Eudragits (Rohm & Pharma) such as Eudragit RS-100, RL-100, RS-30D, RL-30D, RL-PO and RS-PO (ethyl acrylate/methyl methacrylate/chlorotrimethyl methacrylate/ethyl ammonium copolymer) and Eudragit NE-30D (methyl methacrylate/ethyl acrylate copolymer), etc., hydrogenated oils such as hydrogenated castor oil (e.g., LUBRI WAX (Freund Industrial Co., Ltd.), etc.), waxes such as carnauba wax, a fatty acid glycerin ester, paraffin, etc., polyglycerin fatty acid esters, etc.

The swelling polymer is preferably a polymer having an acidic removable group and exhibiting pH-dependent swelling, and a polymer having an acidic removable group, which undergoes a less swelling at an acidic pH such as in the stomach but is swollen extensively at a neutral pH such as in the small and large intestines, is preferred.

Examples of such a polymer having an acidic removable group and exhibiting pH-dependent swelling include a crosslinked polyacrylic acid polymer such as Carbomers 934P, 940, 941, 974P, 980, 1342, etc., polycarbophil and calcium polycarbophil (all manufactured by BF Goodrich Chemicals), Hivis Wakos 103, 104, 105 and 304 (all manufactured by Wako Pure Chemical Industries, Ltd.), etc.

The coating agent used in the sustained release preparation may further contain a hydrophilic material.

Examples of the hydrophilic material include a polysaccharide which may have a sulfate group, such as pullulan, dextrin, alkali metal alginates, etc., a polysaccharide having a hydroxyalkyl group or a carboxyalkyl group such as hydroxypropyl cellulose, hydroxypropylmethyl cellulose, sodium carboxymethylcellulose, etc., methyl cellulose, polyvinyl pyrrolidone, polyvinyl alcohol, polyethylene glycol, etc.

The amount of the water-insoluble material contained in the coating agent of the sustained release preparation is about 30 to about 90% (w/w), preferably about 35 to about 80% (w/w), more preferably about 40 to about 75% (w/w), and the swelling polymer content is about 3 to about 30% (w/w), preferably about 3 to about 15% (w/w). The coating agent may further contain a hydrophilic material, and the amount of the hydrophilic material contained in the coating agent is about 50% (w/w) or less, preferably about 5 to about 40% (w/w), more preferably about 5 to about 35% (w/w). As used herein, the % (w/w) above is used to mean a % by weight based on the coating agent composition, which is the remainder of the coating agent solution after removing any solvent (e.g., water, a lower alcohol such as methanol, ethanol, etc.).

The sustained release preparation is manufactured by preparing a core containing a drug as illustrated below, followed by coating the resulting core with a coating agent solution obtained by heat-melting a water-insoluble material or a swelling polymer or by dissolving or dispersing such a material in a solvent.

I. Production of Drug-Containing Core

The shape of a core containing a drug to be coated with a coating agent (hereinafter sometimes simply referred to as a core) is not specifically limited but preferably prepared into a particulate shape such as granules, fine granules, or the like.

When the core is granules or fine granules, they have a mean particle size of preferably about 150 to about 2,000 μm, more preferably about 500 to about 1,400 μm.

The core can be prepared in a conventional manner. For example, a drug is mixed with a suitable excipient, binder, disintegrating agent, lubricant, stabilizer, etc., and then subjected to wet extrusion granulation, fluidized bed granulation, or the like.

The drug content in the core is about 0.5 to about 95% (w/w), preferably about 5.0 to about 80% (w/w), more preferably about 30 to about 70% (w/w).

Examples of the excipient contained in the core include a saccharide such as saccharose, lactose, mannitol, glucose, etc., starch, crystalline cellulose, calcium phosphate, cornstarch, etc. Among others, crystalline cellulose and cornstarch are preferred.

Examples of the binder used include polyvinyl alcohol, hydroxypropyl cellulose, polyethylene glycol, polyvinyl pyrrolidone, Pluronic F68, gum arabic, gelatin, starch, etc. Examples of the disintegrating agent include calcium carboxymethyl cellulose (ECG505), sodium croscarmellose (Ac-Di-Sol), crosslinked polyvinyl pyrrolidone (crospovidone), low substituted hydroxypropyl cellulose (L-HPC), etc. Among others, hydroxypropyl cellulose, polyvinyl pyrrolidone and low substituted hydroxypropyl cellulose are preferred. Examples of the lubricant and the anticoagulant include talc, magnesium stearate and its inorganic salts, and examples of the lubricant include polyethylene glycol, etc. Examples of the stabilizer include an acid such as tartaric acid, citric acid, succinic acid, fumaric acid, maleic acid, etc.

In addition to the technique described above, the core can be prepared by using other techniques such as an tumbling granulation technique, a pan coating technique, a fluidized bed coating technique and a melt granulation technique, wherein a drug or a mixture of the drug with an excipient, a lubricant, etc. is portionwise added to inert carrier particles as seeds for the core with spraying a binder dissolved in a suitable solvent such as water, a lower alcohol (e.g., methanol, ethanol, etc.) or the like. Examples of the inert carrier particles include those prepared from saccharose, lactose, starch, crystalline cellulose and waxes, and, preferably, these carriers have a mean particle size of about 100 μm to about 1,500 μm.

In order to separate the drug contained in the core from a coating agent, the surface of the core may be covered with a protective material. Examples of the protective material include the hydrophilic material described above and water-insoluble material. The preferred protective material is polyethylene glycol or a polysaccharide having a hydroxyalkyl group or a carboxyalkyl group, more preferably, hydroxypropylmethyl cellulose and hydroxypropyl cellulose. The protective material may contain, as a stabilizer, an acid such as tartaric acid, citric acid, succinic acid, fumaric acid, maleic acid, etc., and a lubricant such as talc. When the protective material is used, the amount thereof to be coated is about 1 to about 15% (w/w), preferably about 1 to about 10% (w/w), more preferably about 2 to about 8% (w/w) based on the core.

The protective material can be coated by a conventional coating method and specifically, the core is spray-coated with the protective material by a fluidized bed coating technique, a pan coating technique, etc.

II. Coating of Core with Coating Agent

The core obtained in I above is coated with a coating agent solution prepared by melt-heating the water-insoluble material and pH-dependent swelling polymer described above and a hydrophilic material or by dissolving or dispersing them in a solvent to obtain a sustained release preparation.

As a coating method of the core with the coating agent solution, there are, for example, spray-coating, etc.

The composition ratio of the water-insoluble material, swelling polymer and hydrophilic material in the coating agent solution can be appropriately chosen to be within the amounts of the respective components contained in the coating.

The amount of the coating agent is about 1 to about 90% (w/w), preferably about 5 to about 50% (w/w), more preferably about 5 to about 35% (w/w) based on the core (excluding the protective material coating).

As the solvent for the coating agent solution, water and an organic solvent can be used singly or as a mixture thereof. When a mixture is used, the ratio of water and the organic solvent (water/organic solvent: a weight ratio) may vary with the range of 1 to 100%, and is preferably 1 to about 30%. The organic solvent is not particularly limited so far as it can dissolve the water-insoluble material, and examples of the solvent include a lower alcohol such as methyl alcohol, ethyl alcohol, isopropyl alcohol, n-butyl alcohol, etc., a lower alkanone such as acetone, acetonitrile, chloroform, methylene chloride, etc. In particular, a lower alcohol is preferred, with ethyl alcohol and isopropyl alcohol being more preferred. Water and a mixture of water and an organic solvent are used preferably as solvents for the coating agent solution. In this case, an acid such as tartaric acid, citric acid, succinic acid, fumaric acid, maleic acid, etc. may be added to the coating agent solution, if necessary, for the purpose of stabilizing the coating agent solution.

To carry out the coating through spray coating, the coating can be made using a conventional coating method. Specifically, the core is sprayed with a coating agent solution by a fluidized bed coating technique, a pan coating technique, or the like. At this time, a lubricant such as talc, titanium oxide, magnesium stearate, calcium stearate, light silicic anhydride, etc., and a plasticizer such as glycerin fatty ester, hardened castor oil, triethyl citrate, cetyl alcohol, stearyl alcohol, etc. may also be added.

After coating with a coating agent, an antistatic agent such as talc may also be admixed, if necessary.

The immediate release preparation may be a liquid (solution, suspension, emulsion, etc.) or a solid (particles, pills, tablets, etc.). An oral preparation and a parenteral preparation such as an injectable preparation may be used, and an oral preparation is preferred.

The immediate release preparation may usually contain a carrier, additives and an excipient (hereinafter sometimes abbreviated as excipients) which are conventionally used in the pharmaceutical field, in addition to a drug which is an active ingredient. The pharmaceutical excipients are not specifically limited so long as they are excipients conventionally used in the pharmaceutical field. Examples of the excipient for an oral solid preparation include lactose, starch, corn starch, crystalline cellulose (Avicel PH101, manufactured by Asahi Kasei Corporation, etc.), powdered sugar, granulated sugar, mannitol, light silicic anhydride, magnesium carbonate, calcium carbonate, L-cysteine, etc., with corn starch and mannitol being preferred. Any of these excipients may be employed alone or in combination with each other. The amounts of the excipients are, for example, about 4.5 to about 99.4 w/w %, preferably about 20 to about 98.5 w/w %, more preferably about 30 to about 97 w/w %, based on the total weight of the immediate release preparation. The content of drug in the immediate release preparation may appropriately be selected from the range of about 0.5% to about 95%, preferably about 1% to about 60% to the whole amount of the immediate release preparation.

When the immediate release preparation is an oral solid preparation, the preparation contains a disintegrating agent in addition to the components described above. Examples of the disintegrating agent include calcium carboxymethylcellulose (ECG505 manufactured by GOTOKU CHEMICAL Co., Ltd.), sodium croscarmellose (for example, Ac-Di-Sol manufactured by Asahi Kasei Corporation), crospovidone (for example, COLIDON CL manufactured by BASF), low-substituted hydroxypropyl cellulose (Shin-Etsu chemical Co., Ltd.), carboxymethyl starch (MATSUTANI CHEMICAL INDUSTRY Co., Ltd.), sodium carboxymethyl starch (EXORITAB manufactured by KIMURA SANGYO), partial α starch (PCS manufactured by Asahi Kasei Corporation), etc. For example, the disintegrating agent that disintegrates granules by water absorption or swelling upon contact with water, or forming a channel between the active component comprising the core and an excipient can be used. Any of these disintegrating agents can be used alone or in combination with each other. The amount of the disintegrating agent used may be appropriately chosen depending upon the type and the amount of the drug used or a particular preparation design for the intended release performance. For example, the amount is about 0.05 to about 30 w/w %, preferably about 0.5 to about 15 w/w % based on the total weight of the immediate release preparation.

When the immediate release preparation is an oral solid preparation, the oral solid preparation may optionally contain additives conventionally used in a solid preparation, in addition to the components described above. Examples of the additives include binders (for example, sucrose, gelatin, powdery gum arabic, methyl cellulose, hydroxypropyl cellulose, hydroxypropylmethyl cellulose, carboxymethylcellulose, polyvinyl pyrrolidone, pullran, dextrin, etc.), lubricants (polyethylene glycol, magnesium stearate, talc, light silicic anhydride (for example, aerosil (NIPPON AEROSIL)), surfactants (for example, anionic surfactants such as sodium alkyl sulfate, nonionic surfactants such as polyoxyethylene fatty ester, polyoxyethylene sorbitan fatty ester, polyoxyethylene castor oil derivatives, etc.), colorants (for example, tar colorants, caramel, colcothar, titanium oxide, riboflavins), if necessary, corrigents (for example, sweeteners, flavors, etc.), adsorbents, preservatives, wetting agents, antistatic agents, etc. Furthermore, an organic acid such as tartaric acid, citric acid, succinic acid, fumaric acid or the like can also be added as a stabilizer.

As the binder above, hydroxypropyl cellulose, polyethylene glycol and polyvinyl pyrrolidone, etc. are preferably used.

The immediate release preparation can be prepared by mixing the components described above and kneading the mixture, if necessary, and then molding according to a conventional technique for making pharmaceutical preparations. The mixing above can be carried out in a conventional manner, e.g., by mixing, kneading, etc. Specifically, where the immediate release preparation is in the form of particles, the preparation can be prepared by mixing components with a vertical granulator, a multi-purpose kneader (manufactured by HATA IRON WORKS CO., LTD), a fluidized bed granulator FD-5S (manufactured by POWREX CORPORATION) or the like, and then granulating the resulting by wet extrusion granulation or fluidized bed granulation by a technique similar to that for preparing the core of the sustained release preparation described above.

The immediate release preparation and the sustained release preparation thus obtained can be compounded, as they are, or, together with appropriate pharmaceutical excipients, in pharmaceutical preparations separately in a conventional manner to prepare respective preparations for administering in combination with each other simultaneously or at certain time intervals. Alternatively, both preparations may be compounded in a single dosage form for oral administration (e.g., granules, fine granules, tablets, capsules) as they are, or, together with appropriate pharmaceutical excipients. Both preparations in the form of granules or fine granules may also be filled in a single capsule for oral administration.

[3] Sublingual, Buccal or Rapid Oral Disintegrating Preparation and its Production

A sublingual, buccal or rapid oral disintegrating preparation may be in the form of a solid preparation such as a tablet, or may be in the form of an oral mucosal patch (film) or oral disintegrating film.

The sublingual, buccal or rapid oral disintegrating preparation is preferably a preparation containing the compound of the present invention or the concomitant drug and an excipient. The preparation may also contain auxiliary agents such as a lubricant, an isotonizing agent, a hydrophilic carrier, a water-dispersible polymer, a stabilizer, etc. Further for the purpose of promoting the absorption and enhancing the bioavailability, the preparation may also contain β-cyclodextrin or β-cyclodextrin derivatives (e.g., hydroxypropyl-β-cyclodextrin, etc.), and the like.

Examples of the above excipient include lactose, saccharose, D-mannitol, starch, crystalline cellulose, light silicic anhydride, etc. Examples of the lubricant include magnesium stearate, calcium stearate, talc, colloidal silica, etc., with magnesium stearate and colloidal silica being preferred. Examples of the isotonizing agent include sodium chloride, glucose, fructose, mannitol, sorbitol, lactose, saccharose, glycerin and urea, with mannitol being particularly preferred. As the hydrophilic carrier, there are, for example, a swelling hydrophilic carrier such as crystalline cellulose, ethyl cellulose, crosslinked polyvinyl pyrrolidone, light silicic anhydride, silicic acid, dicalcium phosphate, calcium carbonate, etc., with crystalline cellulose (e.g., microcrystalline cellulose, etc.) being preferred. As the water-dispersible polymer, there are, for example, a gum (e.g., tragacanth gum, acacia gum, guar gum), alginate (e.g., sodium alginate), cellulose derivatives (e.g., methyl cellulose, carboxymethylcellulose, hydroxymethyl cellulose, hydroxypropyl cellulose, hydroxypropylmethyl cellulose), gelatin, water-soluble starch, polyacrylic acid (e.g., carbomer), polymethacrylic acid, polyvinyl alcohol, polyethylene glycol, polyvinyl pyrrolidone, polycarbophil, ascorbate palmitate salt, etc., with hydroxypropylmethyl cellulose, polyacrylic acid, alginate, gelatin, carboxymethylcellulose, polyvinyl pyrrolidone and polyethylene glycol being preferred. Hydroxypropylmethyl cellulose is particularly preferred. As the stabilizer, there are, for example, cysteine, thiosorbitol, tartatic acid, citric acid, sodium carbonate, ascrobic acid, glycine, sodium sulfite, etc., with citric acid and ascorbic acid being particularly preferred.

The sublingual, buccal or rapid oral disintegrating preparation can be prepared by mixing the compound of the present invention or the concomitant drug and an excipient by a method per se known. Furthermore, if desired, the auxiliary agents described above, such as the lubricant, isotonizing agent, hydrophilic carrier, water-dispersible polymer, stabilizer, colorant, sweetener, preservative, etc. may also be admixed. After mixing the components described above simultaneously or at certain time intervals, the mixture is compressed into tablets to obtain the sublingual, buccal or rapid oral disintegration tablet. In order to obtain a suitable hardness, a solvent such as water, an alcohol, etc. can be used to moisturize or wet the components before or after tabletting, followed by drying.

In preparing the oral mucosal patch (film), the compound of the present invention or the concomitant drug and the water-dispersible polymer (preferably, hydroxypropyl cellulose, hydroxypropylmethyl cellulose), excipient, etc. described above are dissolved in a solvent such as water, etc. and then the resulting solution is cast into a film. In addition, additives such as a plasticizer, a stabilizer, an antioxidant, a preservative, a colorant, a buffering agent, a sweeteners, etc. may be added to the preparation. A glycol such as polyethylene glycol, propylene glycol, etc. may be added to impart an appropriate elasticity to a film, and a bioadhesive polymer (e.g., polycarbophile, carbopol) may also be added to enhance the adhesion of the film to the oral mucosal lining. The casting can be carried out by pouring a solution onto a non-adhesive surface, spreading the solution using a coater such as a doctor blade in a uniform thickness (preferably, approximately 10 to 1000 microns), and then drying the solution to form a film. The film thus formed is dried at room temperature or while warming, and then cut into pieces each having a desired surface area.

A preferred rapid oral disintegrating preparation is, for example, a rapid diffusion preparation in a solid network form, which comprises the compound of the present invention or the concomitant drug and a water-soluble or water-diffusible carrier inert to the compound of the present invention or the concomitant drug. The network is formed by sublimating a solvent from the solid composition comprising a solution of the compound of the present invention or the concomitant drug in a suitable solvent.

In addition to the compound of the present invention or the concomitant drug, the composition of the rapid oral disintegrating preparation may preferably contain a matrix-forming agent and secondary components.

Examples of the matrix-forming agent include gelatins, dextrins and animal or vegetable proteins from soybean, wheat, psyllium seed, etc.; gummy materials such as gum arabic, guar gum, agar, xanthane gum, etc.; polysaccharides; alginates; carboxymethylcelluloses; carrageenans; dextrans; pectins; synthetic polymers such as polyvinyl pyrrolidones; materials derived from gelatin-gum arabic complexes, etc. The matrix-forming agent further includes saccharides such as mannitol, dextrose, lactose, galactose, trehalose, etc.; cyclic saccharides such as cyclodextrins, etc.; inorganic salts such as sodium phosphate, sodium chloride, aluminum silicate, etc.; amino acids having 2 to 12 carbon atoms such as glycine, L-alanine, L-aspartic acid, L-glutamic acid, L-hydroxyproline, L-isoleucine, L-leucine, L-phenylalanine, etc.

One or more matrix-forming agents can be incorporated into a solution or suspension before solidification. The matrix-forming agents may be present in addition to a surfactant, or may be present in the absence of a surfactant. The matrix-forming agents serve not only to form a matrix itself, but also assist to maintain diffusion of the compound of the present invention or the concomitant drug in the solution or suspension.

The composition may contain a secondary component such as a preservative, an antioxidant, a surfactant, a thickening agent, a colorant, pH adjusting agent, a flavor, a sweetener, a taste masking agent, etc. As the suitable colorant, there are, for example, iron oxide red, black and yellow, FD & C dyes available from ERIS & EVERALD such as FD & C Blue No. 2 and FD & C Red No. 40, etc. Examples of the suitable flavor include mint, raspberry, licorice, orange, lemon, grape fruit, caramel, vanilla, cherry, grape flavor and a combination thereof. Examples of the suitable pH adjusting agent include citric acid, tartaric acid, phosphoric acid, hydrochloric acid and maleic acid. Examples of the suitable sweetener include aspartame, acesulfame K and thaumatine. Examples of the suitable taste masking agent include sodium bicarbonate, ion exchange resins, cyclodextrin inclusion compounds, adsorbents and microencapsulated apomorphine.

The preparation generally contains the compound of the present invention or the concomitant drug in an amount of about 0.1 to about 50% by weight, preferably about 0.1 to about 30% by weight and, preferably, the preparation (the sublingual tablet, buccal, etc. described above) allows 90% or more of the compound of the present invention or the concomitant drug to be dissolved (in water) within a time period of about 1 to about 60 minutes, preferably about 1 minute to about 15 minutes, more preferably about 2 minutes to about 5 minutes, or is a rapid oral disintegrating preparation which disintegrates within about 1 to about 60 seconds, preferably about 1 to about 30 seconds, more preferably about 1 to about 10 seconds, after being placed in the oral cavity.

The amount of the above excipient is about 10 to about 99% by weight, preferably about 30 to about 90% by weight based on the total weight of the preparation. The amount of β-cyclodextrin or β-cyclodextrin derivative is about 0 to about 30% by weight based on the total weight of the preparation. The amount of the lubricant is about 0.01 to about 10% by weight, preferably about 1 to about 5% by weight based on the total weight of the preparation. The amount of the isotonizing agent is about 0.1 to about 90% by weight, preferably about 10 to about 70% by weight based on the total weight of the preparation. The amount of the hydrophilic carrier is about 0.1 to about 50% by weight, preferably about 10 to about 30% by weight based on the total weight of the preparation. The amount of the water-dispersible polymer is about 0.1 to about 30% by weight, preferably about 10 to about 25% by weight based on the total weight of the preparation. The amount of the stabilizer is about 0.1 to about 10% by weight, preferably about 1 to about 5% by weight based on the total weight of the preparation. If necessary, the preparation described above may further contain additives such as a colorant, a sweetener, a preservative, etc.

A dose of the combined preparations of the present invention varies depending upon kind of the compound of the present invention, age, body weight, conditions, dosage form, route for administration, dosing period, etc.

A dose of the compound of the present invention may vary depending upon subject to be administered, target organ, conditions, route of administration, etc., and in oral administration, the compound is generally administered to the patient (as 60 kg body weight) with cancer in a daily dose of about 0.01 to about 100 mg, preferably about 0.1 to about 50 mg and more preferably about 0.1 to about 20 mg. In parenteral administration, a single dose of the compound may vary depending upon subject to be administered, target organ, conditions, route of administration, etc., and in the form of an injectable dosage form, it is advantageous to intravenously administer the compound to the patient (as 60 kg body weight) with cancer generally in a daily dose of about 0.001 to about 30 mg, preferably about 0.01 to about 20 mg, and more preferably about 0.01 to about 10 mg. For other animal species, the corresponding dose as converted per 60 kg weight can be administered. Of course, the dose may vary depending on individual conditions as described above; in such a case, a dose less than the dose given above may be sufficient, or a dose higher than the range above may be used.

It is possible to set any range of a dose for the concomitant drug, so long as it causes no adverse side effects. A daily dose of the concomitant drug may vary depending on the severity of disease, the age, sex, body weight and susceptibility of the subject, dosing period and intervals, characteristics, formulation, type and active components of the pharmaceutical preparation, etc. and is not particularly limited. For example, in oral administration, the dose is about 0.001 to 2000 mg, preferably about 0.01 to 500 mg, and more preferably about 0.1 to 100 mg per kg body weight of mammals in terms of a drug; usually, this dose is administered by dividing 1 to 4 times per day.

When the pharmaceutical preparations of the present invention are administered, they may be administered concomitantly. Alternatively, the concomitant drug is first administered and then the compound of the present invention is administered, or the compound of the present invention is first administered and then the concomitant drug is administered. When they are administered at certain time intervals, the intervals vary depending on the active component to be administered, dosage form and route of administration; for example, when the concomitant drug is first administered, the compound of the present invention may be administered within 1 minute to 3 days, preferably 10 minutes to 1 day, more preferably 15 minutes to 1 hour after the administration of the concomitant drug. When the compound of the present invention is first administered, the concomitant drug may be administered within 1 minute to 1 day, preferably 10 minutes to 6 hours, more preferably 15 minutes to 1 hour after the administration of the compound of the present invention.

As a preferred method of administration, for example, about 0.001 to 200 mg/kg of the concomitant drug in the form of an oral dosage preparation is administered orally and, after about 15 minutes, about 0.005 to 0.5 mg/kg of the compound of the present invention in the form of a parenteral preparation is administered parenterally as a daily dose.

As the metastins, there are used, for example, human metastin described in WO 00/24890, mouse or rat metastin described in WO 01/75104, etc.

Specific examples of human metastin include a peptide comprising the N-terminal 47th-54th amino acid sequence in the amino acid sequence represented by SEQ ID NO: 1 and consisting of 8 to 54 amino acid residues, and the like.

The “peptide comprising the N-terminal 47th-54th amino acid sequence in the amino acid sequence represented by SEQ ID NO: 1 and consisting of 8 to 54 amino acid residues” may be any peptide, as far as it is a peptide comprising the N-terminal 47th-54th amino acid sequence in the amino acid sequence represented by SEQ ID NO: 1 and consisting of 8 to 54 amino acid residues, but means that these peptides have substantially the same physiological activity (e.g., a receptor binding activity, a signal transduction action, a sugar level elevating action, a pancreatic glucagon secretion stimulating action, a urine formation promoting action, etc.). Specifically, there are used (i) a peptide having the amino acid sequence represented by SEQ ID NO: 1, (ii) a peptide comprising the N-terminal 47th-54th amino acid sequence at the C terminus in the amino acid sequence represented by SEQ ID NO: 1 and consisting of 8 to 15 amino acid residues, etc.

More specifically, human metastin used includes (i) a peptide consisting of the amino acid sequence represented by SEQ ID NO: 1 (human metastin 54 (1-54)), (ii) a peptide consisting of the N-terminal 40th-54th amino acid sequence in the amino acid sequence represented by SEQ ID NO: 1 (human metastin 15 (40-54); SEQ ID NO: 15), (iii) a peptide consisting of the N-terminal 45th-54th amino acid sequence in the amino acid sequence represented by SEQ ID NO: 1 (human metastin 10 (45-54); SEQ ID NO: 16), (iv) a peptide consisting of the N-terminal 46th-54th amino acid sequence in the amino acid sequence represented by SEQ ID NO: 1 (human metastin 9 (46-54); SEQ ID NO: 17), (v) a peptide consisting of the N-terminal 47th-54th amino acid sequence in the amino acid sequence represented by SEQ ID NO: 1 (human metastin 8 (47-54); SEQ ID NO: 18), etc.

As mouse metastin (A), there are used, for example, (i) a peptide comprising the N-terminal 134th-141 st amino acid sequence in the amino acid sequence represented by SEQ ID NO: 3 and consisting of 8 to 52 amino acid residues. Specific examples of mouse metastin (A) used include (i) a peptide consisting of the N-terminal 90th-141st amino acid sequence in the amino acid sequence represented by SEQ ID NO: 3, (ii) a peptide consisting of the N-terminal 132nd-141 st amino acid sequence in the amino acid sequence represented by SEQ ID NO: 3, (iii) a peptide consisting of the N-terminal 127th-141st amino acid sequence in the amino acid sequence represented by SEQ ID NO: 3, and the like.

As mouse metastin (B), there are used, for example, (i) a peptide comprising the N-terminal 138th-145th amino acid sequence in the amino acid sequence represented by SEQ ID NO: 5 and consisting of 8 to 52 amino acid residues. Specific examples of mouse metastin (B) used include a peptide consisting of the N-terminal 94th-145th amino acid sequence in the amino acid sequence represented by SEQ ID NO: 5, and the like. As rat metastin, there are used, for example, (i) a peptide comprising the N-terminal 112th-119th amino acid sequence in the amino acid sequence represented by SEQ ID NO: 7 and consisting of 8 to 52 amino acid residues. Specific examples of rat metastin used include (i) a peptide consisting of the N-terminal 68th-119th amino acid sequence in the amino acid sequence represented by SEQ ID NO: 7, (ii) a peptide consisting of the N-terminal 110th-119th amino acid sequence in the amino acid sequence represented by SEQ ID NO: 7, (iii) a peptide consisting of the N-terminal 105th-119th amino acid sequence in the amino acid sequence represented by SEQ ID NO: 7, and the like.

Throughout the specification, the metastins are represented in accordance with the conventional way of describing peptides, that is, the N-terminus (amino terminus) at the left hand and the C-terminus (carboxyl terminus) at the right hand. In the peptide represented by SEQ ID NO: 1, the C-terminus may be in any form of a carboxyl group (-COOH), a carboxylate (-COO⁻), an amide (-CONH₂) and an ester (-COOR). Herein, examples of R of the ester group or alkyl amide include a C₁₋₆ alkyl group such as methyl, ethyl, n-propyl, isopropyl, n-butyl, etc.; a C₃₋₈ cycloalkyl group such as cyclopentyl, cyclohexyl, etc.; a C₆₋₁₂ aryl group such as phenyl, α-naphthyl, etc.; a C₇₋₁₄ aralkyl such as a phenyl-C₁₋₂ alkyl group, e.g., benzyl, phenethyl, benzhydryl, etc., or an α-naphthyl-C₁₋₂ alkyl group such as α-naphthylmethyl, etc.; pivaloyloxymethyl group, which are widely used as an ester for oral use, and the like.

Furthermore, the metastins include peptides, wherein the amino group at the N-terminal methionine residue is protected with a protecting group (e.g., a C₁₋₆ acyl group such as a C₂₋₆ alkanoyl group, e.g., formyl group, acetyl group, etc.); those wherein the N-terminal region is cleaved in vivo and the glutamyl group thus formed is pyroglutaminated; those wherein a substituent (e.g., -OH, -SH, amino group, imidazole group, indole group, guanidino group, etc.) on the side chain of an amino acid in the molecule is protected with a suitable protecting group (e.g., a C₁₋₆ acyl group such as a C₂₋₆ alkanoyl group, e.g., formyl group, acetyl group, etc.), or conjugated peptides such as glycopeptides bound to sugar chains.

For salts of the metastin of the present invention, preferred are salts with physiologically acceptable bases (e.g., alkali metal salts) or acids (e.g., organic acids or inorganic acids), etc., especially preferred are physiologically acceptable acid addition salts. Examples of such salts include salts with, for example, inorganic acids (e.g., hydrochloric acid, phosphoric acid, hydrobromic acid, sulfuric acid); salts with organic acids (e.g., acetic acid, formic acid, propionic acid, fumaric acid, maleic acid, succinic acid, tartaric acid, citric acid, malic acid, oxalic acid, benzoic acid, methanesulfonic acid, benzenesulfonic acid) and the like.

As the DNAs encoding metastins, there are used, for example, DNAs encoding human metastin described in WO 00/24890, DNAs encoding mouse or rat metastin described in WO 01/75104, etc.

The DNAs encoding the metastins may be any of genomic DNA, genomic DNA library, cDNA derived from the cells and tissues described above, cDNA library derived from the cells and tissues described above and synthetic DNA. The vector to be used for the library may be any of bacteriophage, plasmid, cosmid and phagemid. The DNA may also be directly amplified by reverse transcriptase polymerase chain reaction (hereinafter abbreviated as RT-PCR) using the total RNA or mRNA fraction prepared from the cells and tissues described above.

The DNA encoding human metastin, mouse metastin precursor (A), mouse metastin precursor (B) or rat metastin precursor may be any DNA, so long as each is a DNA containing a base sequence represented by SEQ ID NO: 2, SEQ ID NO: 4, SEQ ID NO: 6 or SEQ ID NO: 8, or a DNA having a base sequence hybridizable to the base sequence represented by any base sequence represented by SEQ ID NO: 2, SEQ ID NO: 4, SEQ ID NO: 6 or SEQ ID NO: 8 under highly stringent conditions and encoding the human metastin, mouse metastin (A), mouse metastin (B) or rat metastin described above.

Specific examples of the DNA hybridizable to the base sequence represented by any of SEQ ID NO: 2, SEQ ID NO: 4, SEQ ID NO: 6 or SEQ ID NO: 8 include DNAs containing a base sequence having at least about 70% homology, preferably at least about 80% homology, more preferably at least about 90% homology and the most preferably at least about 95% homology, to the base sequence represented by any of SEQ ID NO: 2, SEQ ID NO: 4, SEQ ID NO: 6 or SEQ ID NO: 8.

Homology in the base sequence can be measured using the homology scoring algorithm NCBI BLAST (National Center for Biotechnology Information Basic Local Alignment Search Tool) under the following conditions (an expectation value=10; gaps are allowed; filtering=ON; match score=1; mismatch score=−3).

The hybridization can be carried out by per se publicly known methods or by modifications of these methods, for example, according to the method described in Molecular Cloning, 2nd (J. Sambrook et al., Cold Spring Harbor Lab. Press, 1989). A commercially available library may also be used according to the instructions of the attached manufacturer's protocol. Preferably, the hybridization can be carried out under highly stringent conditions.

The highly stringent conditions used herein are, for example, those in a sodium concentration at about 19 to 40 mM, preferably about 19 to 20 mM at a temperature of about 50 to 70° C., preferably about 60 to 65° C. In particular, hybridization conditions in a sodium concentration of about 19 mM at a temperature of about 65° C. are most preferred.

Specifically, as the DNA encoding the human metastin consisting of the amino acid sequence represented by SEQ ID NO: 1, the DNA consisting of the base sequence represented by SEQ ID NO: 2 is used. Accordingly, for the base sequence encoding the human metastin consisting of the various amino acid sequences described above, a base sequence corresponding to each of the partial amino acid sequences in the amino acid sequence represented by SEQ ID NO: 1 may be chosen from the base sequence represented by SEQ ID NO: 2.

As the DNA encoding the mouse metastin precursor (A) comprising the amino acid sequence represented by SEQ ID NO: 3, there are employed a DNA consisting of the base sequence represented by SEQ ID NO: 4, and the like. Accordingly, for the base sequence encoding the mouse metastin precursor (A) consisting of the various amino acid sequences described above, a base sequence corresponding to each of the partial amino acid sequences in the amino acid sequence represented by SEQ ID NO: 3 may be chosen from the base sequence represented by SEQ ID NO: 4.

As the DNA encoding the mouse metastin precursor (B) comprising the amino acid sequence represented by SEQ ID NO: 5, there are employed a DNA consisting of the base sequence represented by SEQ ID NO: 6, and the like. Accordingly, for the base sequence encoding the mouse metastin precursor (B) comprising of the various amino acid sequences described above, a base sequence corresponding to each of the partial amino acid sequences in the amino acid sequence represented by SEQ ID NO: 5 may be chosen from the base sequence represented by SEQ ID NO: 6.

As the DNA encoding the rat metastin comprising the amino acid sequence represented by SEQ ID NO: 7, there are employed a DNA consisting of the base sequence represented by SEQ ID NO: 8, and the like. Accordingly, for the base sequence encoding the rat metastin consisting of the various amino acid sequences described above, a base sequence corresponding to each of the partial amino acid sequences in the amino acid sequence represented by SEQ ID NO: 7 may be chosen from the base sequence represented by SEQ ID NO: 8.

More specifically, for the peptide consisting of the amino acid sequence represented by SEQ ID NO: 1 (human metastin 54 (1-54)), a DNA containing the base sequence represented by SEQ ID NO: 2, etc. is used.

For the peptide consisting of the N-terminal 40th-54th amino acid sequence in the amino acid sequence represented by SEQ ID NO: 1 (human metastin 15 (40-54); SEQ ID NO: 15), a DNA containing the base sequence represented by SEQ ID NO: 19, etc. is used.

For the peptide consisting of the N-terminal 45th-54th amino acid sequence in the amino acid sequence represented by SEQ ID NO: 1 (human metastin 10 (45-54); represented by SEQ ID NO: 16), a DNA containing the base sequence represented by SEQ ID NO: 20, etc. is used.

For the peptide consisting of the N-terminal 46th-54th amino acid sequence in the amino acid sequence represented by SEQ ID NO: 1 (human metastin 9 (46-54); represented by SEQ ID NO: 17), a DNA containing the base sequence represented by SEQ ID NO: 21, etc. is used.

For the peptide consisting of the N-terminal 47th-54th amino acid sequence in the amino acid sequence represented by SEQ ID NO: 1 (human metastin 8 (47-54); represented by SEQ ID NO: 18), a DNA containing the base sequence represented by SEQ ID NO: 22, etc. is used.

As the metastin receptor, its partial peptides or salts thereof, there are used, for example, a human metastin receptor, its partial peptides or salts thereof described in WO 00/24890, a mouse or rat human metastin receptor, its partial peptides or salts thereof described in WO 01/75104, etc.

Specifically, a protein comprising the same or substantially the same amino acid sequence as the amino acid sequence represented by SEQ ID NO: 9, SEQ ID NO: 11 or SEQ ID NO: 13, etc. is used as the metastin receptor.

The amino acid sequence which is substantially the same amino acid sequence as the amino acid sequence represented by SEQ ID NO: 9, SEQ ID NO: 11 or SEQ ID NO: 13 includes, for example, an amino acid sequence having at least about 70% homology, preferably at least about 80% homology, more preferably at least about 90% homology, and most preferably at least about 95% homology, to the amino acid sequence represented by SEQ ID NO: 9, SEQ ID NO: 11 or SEQ ID NO: 13.

Homology of the amino acid sequences can be determined using the homology scoring algorithm NCBI BLAST (National Center for Biotechnology Information Basic Local Alignment Search Tool) under the following conditions (an expectation value=10; gaps are allowed; matrix=BLOSUM62; filtering=OFF).

As the protein comprising substantially the same amino acid sequence as the amino acid sequence represented by SEQ ID NO: 9, SEQ ID NO: 11 or SEQ ID NO: 13, preferred is a protein having substantially the same amino acid sequence as the amino acid sequence represented by SEQ ID NO: 9, SEQ ID NO: 11 or SEQ ID NO: 13 and having the activity of the same nature as that of a protein having the amino acid sequence represented by SEQ ID NO: 9, SEQ ID NO: 11 or SEQ ID NO: 13, etc.

As the activity of substantially the same nature, there are, for example, a ligand binding activity, a signal transduction activity, and the like. The “substantially the same nature” is used to mean that the nature of these activities is equivalent in terms of quality. Thus, the activities such as a ligand binding activity, a signal transduction activity, etc. are preferably equivalent (e.g., about 0.01 to 100 times, preferably about 0.5 to 10 times, more preferably 0.5 to 2 times), but differences in quantitative factors such as a level of these activities, or such as a molecular weight of the protein may be present and allowable.

The activities such as a ligand binding activity, a signal transduction activity, etc. can be assayed by per se publicly known method with modifications and may be determined according to methods of determining a ligand or screening methods described in, e.g., WO 00/24890 or WO 01/75104.

Examples of the metastin receptor used include proteins comprising (i) the amino acid sequence represented by SEQ ID NO: 9, SEQ ID NO: 11 or SEQ ID NO: 13, of which at least 1 or 2 (preferably about 1 to about 30, more preferably about 1 to about 10 and most preferably several (1 or 2)) amino acids are deleted; (ii) the amino acid sequence represented by SEQ ID NO: 9, SEQ ID NO: 11 or SEQ ID NO: 13, to which at least 1 or 2 (preferably about 1 to about 30, more preferably about 1 to about 10 and most preferably several (1 or 2)) amino acids are added; (iii) the amino acid sequence represented by SEQ ID NO: 9, SEQ ID NO: 11 or SEQ ID NO: 13, in which at least 1 or 2 (preferably about 1 to about 30, more preferably about 1 to about 10 and most preferably several (1 or 2)) amino acids are substituted by other amino acids; or (iv) a combination of these amino acid sequences; and the like.

Throughout the specification, the metastin receptors are represented in accordance with the conventional way of describing peptides, that is, the N-terminus (amino terminus) at the left hand and the C-terminus (carboxyl terminus) at the right hand. In the metastin receptors including the metastin receptor represented by SEQ ID NO: 9, SEQ ID NO: 11 or SEQ ID NO: 13, the C-terminus may be in any form of a carboxyl group (-COOH), a carboxylate (-COO-), an amide (-CONH₂) and an ester (-COOR). Herein, examples of R of the ester group include a C₁₋₆ alkyl group such as methyl, ethyl, n-propyl, isopropyl, n-butyl, etc.; a C₃₋₈ cycloalkyl group such as cyclopentyl, cyclohexyl, etc.; a C₆₋₁₂ aryl group such as phenyl, α-naphthyl, etc.; a C₇₋₁₄ aralkyl such as a phenyl-C₁₋₂ alkyl group, e.g., benzyl, phenethyl, etc., or an α-naphthyl-C₁₋₂ alkyl group such as α-naphthylmethyl, etc.; and pivaloyloxymethyl group, which are widely used as an ester for oral use, and the like.

Where the metastin receptors contain a carboxyl group (or a carboxylate) at a position other than the C-terminus, the carboxyl group may be amidated or esterified and such amides or esters are also included within the receptor protein of the present invention. In this case, the ester group used may be the same group as the C-terminal esters described above.

Furthermore, the metastin receptors include those wherein the amino group at the N-terminal methionine residue is protected with a protecting group (e.g., a C₁₋₆ acyl group such as a C₂₋₆ alkanoyl group, e.g., formyl group, acetyl group, etc.); those wherein the N-terminal region is cleaved in vivo and the glutamyl group thus formed is pyroglutaminated; those wherein a substituent (e.g., -OH, -SH, amino group, imidazole group, indole group, guanidino group, etc.) on the side chain of an amino acid in the molecule is protected with a suitable protecting group (e.g., a C₁₋₆ acyl group such as a C₂₋₆ alkanoyl group, e.g., formyl group, acetyl group, etc.), or conjugated proteins such as glycoproteins bound to sugar chains.

Specific examples of the metastin receptors include human metastin receptor consisting of the amino acid sequence represented by SEQ ID NO: 9, rat metastin receptor consisting of the amino acid sequence represented by SEQ ID NO: 11, mouse metastin receptor consisting of the amino acid sequence represented by SEQ ID NO: 13, etc.

The partial peptides of the metastin receptor (hereinafter sometimes simply referred to as the partial peptide) may be any peptide, so long as they are partial peptides of the metastin receptor described above; there are used those such as protein molecules of the metastin receptor, which are the sites exposed outside the cell membrane, and having a ligand binding activity.

Specifically, the partial peptide of the metastin receptor consisting of the amino acid sequence represented by SEQ ID NO: 9, SEQ ID NO: 11 or SEQ ID NO: 13 is a peptide containing the parts analyzed to be extracellular domains (hydrophilic domains) in the hydrophobic plotting analysis. A peptide containing a hydrophobic domain in part can be used as well. In addition, the peptide may contain each domain separately or a plurality of domains together.

In the metastin receptor, preferred partial peptides are those having the number of amino acids of at least 20, preferably at least 50, and more preferably at least 100, in the amino acid sequence described above, which constitutes the metastin receptor.

The partial peptide may be a peptide having the amino acid sequence described above, of which at least 1 or 2 (preferably about 1 to about 10 and more preferably several (1 or 2)) amino acids are deleted; to which at least 1 or 2 (preferably about 1 to about 10 and more preferably several (1 or 2)) amino acids are added; or, in which at least 1 or 2 (preferably about 1 to about 10 and more preferably several (1 or 2)) amino acids are substituted by other amino acids. In the partial peptide, the C terminus may be any form of a carboxyl group (-COOH), a carboxylate (-COO⁻), an amide (-CONH₂) and an ester (-COOR), as in the metastin receptor described above.

Furthermore, the partial peptides include peptides, wherein the amino group at the N-terminal methionine residue is protected with a protecting group; those wherein the N-terminal region is cleaved in vivo and the glutamyl group thus formed is pyroglutaminated; those wherein a substituent on the side chain of an amino acid in the molecule is protected with a suitable protecting group, or conjugated peptides such as glycopeptides bound to sugar chains, as in the metastin receptors described above.

For salts of the metastin receptor or the partial peptide, preferred are salts with physiologically acceptable acids, especially physiologically acceptable acid addition salts. Examples of the salts include salts with, for example, inorganic acids (e.g., hydrochloric acid, phosphoric acid, hydrobromic acid, sulfuric acid); salts with organic acids (e.g., acetic acid, formic acid, propionic acid, fumaric acid, maleic acid, succinic acid, tartaric acid, citric acid, malic acid, oxalic acid, benzoic acid, methanesulfonic acid, benzenesulfonic acid) and the like.

As the DNA encoding the metastin receptor or its partial peptides, there are used, for example, a DNA encoding the human metastin receptor or its partial peptides described in WO 00/24890, a DNA encoding the mouse or rat metastin receptor or its partial peptides described in WO 01/75104, etc.

The DNAs encoding the metastin receptor or its partial peptides may be any of genomic DNA, genomic DNA library, cDNA derived from the cells and tissues described above, cDNA library derived from the cells and tissues described above and synthetic DNA. The vector to be used for the library may be any of bacteriophage, plasmid, cosmid and phagemid. The DNA may also be directly amplified by reverse transcriptase polymerase chain reaction (hereinafter abbreviated as RT-PCR) using the total RNA or mRNA fraction prepared from the cells and tissues described above.

Specifically, the DNA encoding human metastin receptor, mouse metastin receptor or rat metastin receptor may be any DNA, so long as it is a DNA comprising each base sequence represented by SEQ ID NO: 10, SEQ ID NO: 12 or SEQ ID NO: 14, or a DNA comprising a base sequence hybridizable to the base sequence represented by SEQ ID NO: 10, SEQ ID NO: 12 or SEQ ID NO: 14 under highly stringent conditions and encoding a receptor having the activity of substantially the same nature (e.g., a ligand binding activity, a signal transduction activity, etc.) as that of the human metastin receptor, mouse metastin receptor or rat metastin receptor consisting of the amino acid sequence represented by SEQ ID NO: 10, SEQ ID NO: 12 or SEQ ID NO: 14.

Examples of the DNA hybridizable to the base sequence represented by any of SEQ ID NO: 10, SEQ ID NO: 12 or SEQ ID NO: 14 include DNAs comprising a base sequence having at least about 70% homology, preferably at least about 80% homology, more preferably at least about 90% homology and the most preferably at least about 95% homology, to the base sequence represented by any of SEQ ID NO: 10, SEQ ID NO: 12 or SEQ ID NO: 14.

Homology in the base sequence can be measured using the homology scoring algorithm NCBI BLAST (National Center for Biotechnology Information Basic Local Alignment Search Tool) under the following conditions (an expectation value=10; gaps are allowed; filtering=ON; match score=1; mismatch score=−3).

The hybridization can be carried out by per se publicly known methods or by modifications of these methods, for example, according to the method described in Molecular Cloning, 2nd (J. Sambrook et al., Cold Spring Harbor Lab. Press, 1989), etc. A commercially available library may also be used according to the instructions of the attached manufacturer's protocol. Preferably, the hybridization can be carried out under highly stringent conditions.

The highly stringent conditions used herein are, for example, those in a sodium concentration at about 19 to 40 mM, preferably about 19 to 20 mM at a temperature of about 50 to 70° C., preferably about 60 to 65° C. In particular, hybridization conditions in a sodium concentration of about 19 mM at a temperature of about 65° C. are most preferred.

More specifically, as the DNA encoding the human metastin receptor consisting of the amino acid sequence represented by SEQ ID NO: 9, the DNA consisting of the base sequence represented by SEQ ID NO: 10 is used.

As the DNA encoding the rat metastin receptor consisting of the amino acid sequence represented by SEQ ID NO: 11, the DNA consisting of the base sequence represented by SEQ ID NO: 12 is used.

As the DNA encoding the mouse metastin receptor consisting of the amino acid sequence represented by SEQ ID NO: 13, the DNA consisting of the base sequence represented by SEQ ID NO: 14 is used.

The metastin receptors, their partial peptides or salts thereof and the DNAs encoding the metastin receptors or their partial peptides can be obtained or produced by the methods described in WO 00/24890 or WO 01/75104.

The present invention will be described in detail by referring to EXAMPLES, FORMULATION EXAMPLES AND TEST EXAMPLES, but is not deemed to be limited thereto, and any modification may be made without departing from the scope of the present invention.

In the following EXAMPLES, the term “room temperature” normally means a temperature of about 10° C. to about 35° C. In percentages, the yield is shown by mol/mol % and the solvent used in chromatography by vol %, and the remaining by wt %. In proton NMR spectra, data on OH, NH protons, etc. that are broad and unidentified are not shown.

The other abbreviations used in the specification mean as follows.

Abbreviation Description 10Ψ, CSNH: The C-terminal-CONH₂ at the 10-position is substituted with —CSNH2. 1Ψ2, CH₂NH: The —CONH— bond between the 1- and 2-positions is substituted with the —CH₂NH— bond. 2Ψ3, CH₂NH: The —CONH— bond between the 2- and 3-positions is substituted with the —CH₂NH— bond. 3Ψ4, CH₂NH: The —CONH— bond between the 3- and 4-positions is substituted with the —CH₂NH— bond. 4Ψ5, CH₂NH: The —CONH— bond between the 4- and 5-positions is substituted with the —CH₂NH— bond. 6Ψ7, CSNH: The —CONH— bond between the 6- and 7-positions is substituted with the —CSNH— bond. 6Ψ7, NHCO: The —CONH— bond between the 6- and 7-positions is substituted with the —NHCO— bond. 6Ψ7, CH₂NH: The —CONH— bond between the 6- and 7-positions is substituted with the —CH₂NH— bond. 6Ψ7, CH₂O: The —CONH— bond between the 6- and 7-positions is substituted with the —CH₂O— bond. 7Ψ8, CH₂NH: The —CONH— bond between the 7- and 8-positions is substituted with the —CH₂NH— bond. 8Ψ9, CH₂NH: The —CONH— bond between the 8- and 9-positions is substituted with the —CH₂NH— bond. 9Ψ10, CH₂NH: The —CONH— bond between the 9- and 10-positions is substituted with the —CH₂NH— bond. Aad: 2-aminoadipic acid Abu: 2-aminobutanoic acid Abz(2): 2-aminobenzoic acid Abz(3): 3-aminobenzoic acid Ac: acetyl AcONB: N-acetoxy-5-norbornene-2,3-dicarboximide Acp: 6-aminocaproic acid AcOEt: ethyl acetate AcOH: acetic acid Aib: α-aminoisobutanoic acid Ala(2-Qui): 2-quinolylalanine Ala(3-Bzt): 3-benzothienylalanine Ala(cBu): cyclobutylalanine Ala(cPr): cyclopropylalanine Ala(Pip): (4-piperidin-1-yl)alanine Alb: Albizziin 2-amino-3-ureidopropionic acid Ambz(4): 4-aminomethylbenzoyl Arg(Ac): N^(ω)-acetylarginine Arg(Boc₂,Me): N^(ω,ω′)-bis-tert-butoxycarbonyl-N^(ω)-methylarginine Arg(Et): N^(ω)-ethy1arginine Arg(Me): N^(ω)-methylarginine Arg(asyMe₂) or Arg(Me₂)asym: asymmetric-N^(ω,ω)-dimethy1arginine Arg(symMe₂) or Arg(Me₂) sym: symmetric-N^(ω,ω′)-dimethy1arginine Arg(NO₂): N^(ω)-nitroarginine Arg(Pbf): N^(ω)-2,2,4,6,7-pentamethyldihydrobenzofuransulfonylarginine Arg(n-Pr): N^(ω)-propylarginine Arg(Tos): N^(ω)-tosylarginine Asp(NHMe): N^(ω)-methylasparagine Asp(NMe₂): N^(ω,ω)-dimethylasparagine Asp(NHPen): N^(ω)-pentylasparagine Asp(NHcPr): N^(ω)-cyclopropylasparagine Asp(NHBzl): N^(ω)-benzylasparagine AzaGly: azaglycine AzaPhe: azaphenylalanine Aze(2): azetidine-2-carboxylic acid β-Ala: β-alanine Boc: tert-butoxycarbonyl Boc₂O: di-tert-butyl dicarbonate Br-Z: 2-bromobenzyloxycarbonyl Bu^(t): tert-butyl Bzl: benzyl CDI: 1,1′-carbonyldiimidazole Cha: cyclohexylalanine CIP: 2-chloro-1,3-dimethylimidazolium tetrafluoroborate Cit: citrulline Clt resin: 2-chlorotrytyl resin Cl-Z: 2-chlorobenzyloxycarbonyl Dab: 2,4-diaminobutanoic acid Dap: 2,3-diaminopropionic acid Dap(Ac): N^(β)-acety1-β-diaminopropionic acid Dap(For): N^(β)-formy1-β-diaminopropionic acid Dap(Gly): N^(β)-glycyl-β-diaminopropionic acid Dap(GnGly): N^(β)-(N-guanidinoglycyl)-β-diaminopropionic acid DCM: dichloromethane DEA: diethylamine DIEA: N,N-diisopropylethylamine DIPCDI: 1,3-diisopropylcarbodiimide DMAP: 4-dimethylaminopyridine DMF: N,N-dimethylformamide EDC: 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide EDT: 1,2-ethanedithiol Fmoc: 9-fluorenylmethoxycarbonyl For: formyl γ-Abu: 4-aminobutanoic acid γ-MeLeu, Leu(Me): γ-methylleucine GlyΨ((E)CH═CH)Leu: The —CONH— between Gly and Leu is substituted with (E) type alkene. G1yΨ(CH₂CH₂)Leu: The —CONH— between Gly and Leu is substituted with the —CH₂CH₂— bond. G1yΨCH₂S)Leu: The —CONH— between Gly and Leu is substituted with the —CH₂S— bond. Gn: guanidino GuAmb: 4-guanidinomethylbenzoyl Har: homoarginine Har(Me): N^(ω)-methylhomoarginine His(3Me): 3-methylhistidine π-methylhistidine HOAt: 1-hydroxy-7-azabenzotriazole HOBt: 1-hydroxybenzotriazole HOOBt: 3,4-dihydro-3-hydroxy-4-oxo-1,2,3-benzotriazine HONB: N-hydroxy-5-norbornene-2, 3-dicarboximide Hph: homophenylalanine Hyp: trans-4-hydroxyproline Hyp(Bzl): O-benzyl-trans-4-hydroxyproline IndPr: 3-(indole-3-yl)propionyl Izc: imidazolidine-2-carboxylic acid Lys(Me₂): N^(E,E)-dimethyllysine MBHA: p-methylbenzhydrylamine MeOH: methanol Mtt: 4-methyltrytyl N((CH₂)₃Gn)Gly: N-(3-guanidinopropyl)glycine Nal(1): 1-naphthylalanine Nal(2): 2-naphthylalanine Nar: norarginine Nar(Me): N^(ω)-methy1norarginine Nle: norleucine NMeAla: N^(α)-methylalanine NMeArg: N^(α)-methylarginine NMeAsn: N^(α)-methylasparagine NMeLeu: N^(α)-methylleucine NMePhe: N^(α)-methylphenylalanine NMeSer: N^(α)-methylserine NMeTrp: N^(α)-methyltryptophan NMeTyr: N^(α)-methyltyrosine Nva: norvaline OBu^(t): tert-butoxy Orn: ornithine Orn(Mtt): N^(δ)-(4-methyltrytyl)ornithine PAL: 5-(4-(9-fluorenylmethoxycarbonyl)aminomethy- 3,5-dimethoxyphenoxy)valeric acid Pbf: 2,2,4,6,7-pentamethyldihydrobenzofuran-5-sulfonyl pGlu: pyroglutamic acid Phe(2Cl): 2-chlorophenylalanine Phe(2F): 2-fluorophenylalanine Phe(3, 4Cl₂): 3,4-dichlorophenylalanine Phe(3, 4F₂): 3,4-difluorophenylalanine Phe(3CF₃): 3-trifluoromethylphenylalanine Phe(3Cl): 3-chlorophenylalanine Phe(3F): 3-fluorophenylalanine Phe(4C1): 4-chlorophenylalanine Phe(4CN): 4-cyanophenylalanine Phe(4F): 4-fluorophenylalanine Phe(4Gn): 4-guanidinophenylalanine Phe(4NH₂): 4-aminophenylalanine Phe(4NO₂): 4-nitrophenylalanine Phe(4CN): 4-cyanophenylalanine Phe(F₅): pentafluorophenylalanine Phe(2Me): 2-methylphenylalanine Phe(3Me): 3-methylphenylalanine Phe(4Me): 4-methylphenylalanine PheΨ(CH₂CH₂)AzaGly: The —CONH— between Phe and AzaGly is substituted with the —CH₂CH₂— bond. PheΨ((E)CH═CH)Gly: The —CONH— bond between Phe and Gly is substituted with the (E) type alkene. PheΨ(CH₂CH₂)Gly: The —CONH— bond between Phe and Gly is substituted with the —CH₂CH₂— bond. PheΨ(CH₂S)Gly: The —CONH— bond between Phe and Gly is substituted with the —CH₂S— bond. PheΨ((R)CH(OH)—(E)CH═)G1y: The —CONH— bond between Phe and Gly is substituted with the —CH(OH)—CH— bond, the —CH(OH)— moiety takes (R) configuration, and the moiety between the carbon atom in the —CH— moiety and α carbon atom of the Gly is (E) type alkene. PheΨ((S)CH(OH)—(E)CH═)Gly: The —CONH— bond between Phe and Gly is substituted with the —CH(OH)—CH— bond, the —CH(OH)— moiety takes (S) configuration, and the moiety between the carbon atom in the —CH— moiety and α carbon atom of the Gly is (E) type alkene. PheΨ((R)CH(OH)—CH₂)Gly: The —CONH— bond between Phe and Gly and is substituted with the —CH(OH)—CH₂— bond, and the —CH(OH)— moiety takes (R) configuration. PheΨ((S)CH(OH)—CH₂)Gly: The —CONH— bond between Phe and Gly is substituted with the —CH(OH)—CH₂— bond and the —CH(OH)— moiety takes (S) configuration. PheΨ(CH₂O)Gly: The —CONH— bond between Phe and Gly is substituted with the —CH₂O— bond. PheΨ(COCH₂)Gly: The —CONH— bond between Phe and Gly is substituted with the —COCH₂— bond. PheΨ(CSNH)—NH₂: The C-terminal phenylalanylamide is substituted with phenylalanylthioamide. Phg: phenylglycine PhOH: phenol PhSMe: thioanisole Pic(2): pipecolinic acid Pic(3): 3-piperidinecarboxylic acid Pip: pipecolinic acid Pro: proline Pro(4F): trans-4-fluoroproline Pro(4NH₂): cis-4-aminoproline Pya(2): 2-pyridylalanine Pya(3): 3-pyridylalanine Pya(4): 4-pyridylalanine PyAOP: (7-azabenzotriazole-1-yloxy)-tris(pyrrolidino)phosphonium hexafluorophosphate PyBOP: (benzotriazol-1-yloxy)-tris(pyrrolidino)phosphonium hexafluorophosphate PyBrop: bromo-tris(pyrrolidino)phosphonium hexafluorophosphate Pzc(2): piperazine-2-carboxylic acid Sar: N-methylglycine Ser(Ac): O-acetylserine Ser(Me): O-methylserine Thi: 2-thienylalanine Thz: thioproline Tic: 1,2,3,4-tetrahydroisoquinoline-2-carboxylic acid TIS: triisopropylsilane Tle: tert-leucine Tos: tosyl Trp(For): N^(in)-formyltryptophan Trt: trytyl Tyr(Me): O-methyltyrosine Tyr(PO₃H₂): O-phosphotyrosine TyrΨ(CH₂NH)Asn: The —CONH— between Tyr and Asn is substituted with the —CH₂NH— bond. TFA: trifluoroacetic acid TFE: trifluoroethanol Z: benzyloxycarbonyl

In the specification and drawings, where the codes of bases and amino acids are denoted by abbreviations, they are based on the abbreviations in accordance with the IUPAC-IUB Commission on Biochemical Nomenclature or the common codes in the art, examples of which are shown below. For amino acids that may have the optical isomer, L form is presented unless otherwise indicated.

-   DNA: deoxyribonucleic acid -   cDNA: complementary deoxyribonucleic acid -   A: adenine -   T: thymine -   G: guanine -   C: cytosine -   Y: thymine or cytosine -   N: thymine, cytosine, adenine or guanine -   R: adenine or guanine -   M: cytosine or adenine -   W: thymine or adenine -   S: cytosine or guanine -   RNA: ribonucleic acid -   mRNA: messenger ribonucleic acid -   dATP: deoxyadenosine triphosphate -   dTTP: deoxythymidine triphosphate -   dGTP: deoxyguanosine triphosphate -   dCTP: deoxycytidine triphosphate -   ATP: adenosine triphosphate -   EDTA: ethylenediaminetetraacetic acid -   SDS: sodium dodecyl sulfate -   TFA: trifluoroacetic acid -   EIA: enzyme immunoassay -   Gly or G: glycine -   Ala or A: alanine -   Val or V: valine -   Leu or L: leucine -   Ile or I: isoleucine -   Ser or S: serine -   Thr or T: threonine -   Cys or C: cysteine -   Met or M: methionine -   Glu or E: glutamic acid -   Asp or D: aspartic acid -   Lys or K: lysine -   Arg or R: arginine -   His or H: histidine -   Phe or F: phenylalanine -   Tyr or Y: tyrosine -   Trp or W: tryptophan -   Pro or P: proline -   Asn or N: asparagine -   Gln or Q: glutamine -   pGlu: pyroglutamic acid

The sequence identification numbers in the sequence listing of the specification indicates the following sequence, respectively.

[SEQ ID NO: 1]

This shows the amino acid sequence of human-derived metastin (Metastin).

[SEQ ID NO: 2]

This shows the base sequence of DNA encoding human metastin.

[SEQ ID NO: 3]

This shows the amino acid sequence of mouse metastin precursor (A).

[SEQ ID NO: 4]

This shows the base sequence of DNA encoding mouse metastin precursor (A), which is the base sequence in plasmid pCMV-mKiSS-1 harbored on transformant Escherichia coli DH10B/pCMV-mKiSS-1.

[SEQ ID NO: 5]

This shows the amino acid sequence of mouse metastin precursor (B).

[SEQ ID NO: 6]

This shows the base sequence of DNA encoding mouse metastin precursor (B), which is the base sequence in plasmid pCR2.1-mKiSS-1.4A harbored on transformant Escherichia coli DH5α/pCR2.1-mKiSS-1.4A.

[SEQ ID NO: 7]

This shows the amino acid sequence of rat-derived metastin precursor.

[SEQ ID NO: 8]

This shows the base sequence of DNA encoding rat metastin precursor.

[SEQ ID NO: 9]

This shows the amino acid sequence of human OT7T175 (metastin receptor).

[SEQ ID NO: 10]

This shows the base sequence of DNA encoding human OT7T175 (metastin receptor).

[SEQ ID NO: 11]

This shows the amino acid sequence of rat OT7T175 (metastin receptor).

[SEQ ID NO: 12]

This shows the base sequence of DNA encoding rat OT7T175 (metastin receptor).

[SEQ ID NO: 13]

This shows the amino acid sequence of mouse OT7T175 (metastin receptor).

[SEQ ID NO: 14]

This shows the base sequence of DNA encoding mouse OT7T175 (metastin receptor).

[SEQ ID NO: 15]

This shows the amino acid sequence of human metastin 15 (40-54).

[SEQ ID NO: 16]

This shows the amino acid sequence of human metastin 10 (45-54) (MS10).

[SEQ ID NO: 17]

This shows the amino acid sequence of human metastin 9 (46-54).

[SEQ ID NO: 18]

This shows the amino acid sequence of human metastin 8 (47-54).

[SEQ ID NO: 19]

This shows the base sequence of DNA encoding human metastin 15 (40-54).

[SEQ ID NO: 20]

This shows the base sequence of DNA encoding human metastin 10 (45-54).

[SEQ ID NO: 21]

This shows the base sequence of DNA encoding human metastin 9 (46-54).

[SEQ ID NO: 22]

This shows the base sequence of DNA encoding human metastin 8 (47-54)

The transformant Escherichia coli DH10B/pCMV-mKiSS-1 has been on deposit since Jan. 24, 2000 with International Patent Organisms Depository, National Institute of Advanced Industrial Science and Technology (the former Ministry of International Trade and Industry, Agency of Industrial Science and Technology, National Institute of Bioscience and Human Technology (NIBH)), located at Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki (postal code 305-8566), Japan, as the Accession Number FERM BP-7003 and since Dec. 16, 1999 with Institute for Fermentation (IFO), located at 2-17-85, Juso-Honmachi, Yodogawa-ku, Osaka-shi, Osaka, Japan, as the Accession Number IFO 16348.

The transformant Escherichia coli DH5α/pCR2.1-mKiSS-1.4A has been on deposit since Mar. 6, 2000 with International Patent Organisms Depository, National Institute of Advanced Industrial Science and Technology (the former Ministry of International Trade and Industry, Agency of Industrial Science and Technology, National Institute of Bioscience and Human Technology (NIBH)), located at Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki (postal code 305-8566), Japan, as the Accession Number FERM BP-7073 and since Feb. 16, 2000 with Institute for Fermentation (IFO), located at 2-17-85 Juso-Honmachi, Yodogawa-ku, Osaka-shi, Osaka, Japan, as the Accession Number IFO 16360.

REFERENCE EXAMPLE 1 Production of N-methyl-N,N′-Bis-Boc-1-guanylpyrazole

In a nitrogen atmosphere, 720 mg of 60% NaH in oil was dissolved in 20 mL of dry DMF and 20 mL of dry DMF solution of 5.59 g of N,N′-Bis-Boc-1-guanylpyrazole commercially available was added to the solution at 0° C., followed by stirring for 10 minutes. After 1.68 mL of methyl iodide was added thereto, the mixture was stirred at room temperature for 24 hours. After the solvent was removed by distillation, the residue was dissolved in AcOEt and the solution was washed with 1N HCl aq. solution, satd. NaHCO₃ aq. solution and then satd. NaCl aq. solution. After drying over Na₂SO₄, the solvent was concentrated and the concentrate was purified by flash column chromatography (ethyl acetate/n-hexane=1/4) using silica gel 60 (200 mL) to give 5.35 g (yield 91.6%) of N-methyl-N,N′-bis-Boc-1-guanylpyrazole.

¹H NMR (300 MHz, CDCl₃): δ 8.00 (br s, 1H), 7.69 (br s, 1H), 6.42 (dd, 1H, J=2.7, 1.5 Hz), 3.25 (s, 3H), 1.53 (s, 9H), 1.30 (s, 9H)

Elemental analysis as C₁₅H₂₄N₄O₄

Calcd.: C, 55.54; H, 7.46; N, 17.27.

Found: C, 55.36; H, 7.48; N, 17.06. Rf1: 0.64, Rf2: 0.79

Developing solvent for TLC:

-   -   Rf1 (ethyl acetate/n-hexane=1/2), Rf2 (methanol/chloroform=2/98)

Elution time on HPLC: 26.7 mins.

Elution Conditions:

Column: Wakosil-II 5C18 HG (4.6×100 mm)

Eluant: Linear density gradient elution with eluants A/B=100/0-20/80, using eluant A: 0.1% TFA-water and eluant B: 0.1% TFA-containing acetonitrile (40 mins.)

Flow rate: 1.0 mL/min.

REFERENCE EXAMPLE 2 Production of N-methyl-N,N′-Bis-Z-1-guanylpyrazole

In an argon atmosphere, 40 mg of 60% NaH in oil was dissolved in 5 mL of dry DMF and 5 mL of dry DMF solution of 380 mg of N,N′-Bis-Z-1-guanylpyrazole commercially available was added to the solution at 0° C., followed by stirring for 10 minutes. After 125 μL of methyl iodide was added thereto, the mixture was stirred at room temperature for 15 hours. After the solvent was distilled off, the residue was dissolved in AcOEt and the solution was washed with 1N HCl aq. solution, satd. NaHCO₃ aq. solution and then satd. NaCl aq. solution. After drying over Na₂SO₄, the solvent was concentrated to give 393 mg of the crude product. From the crude product, 170 mg was purified by flash column chromatography (ethyl acetate/n-hexane=1/4) using silica gel 60 (75 mL) to give 152 mg (yield 89.5%) of N-methyl-N,N′-bis-Z-1-guanylpyrazole.

¹H NMR (300 MHz, CDCl₃): δ 7.97 (br s, 1H), 7.61 (d, 1H, J=1.0 Hz), 7.37-7.32 (m, 4H), 7.29-7.26 (m, 4H), 7.16-7.13 (m, 2H), 6.36 (dd, 1H, J=2.8, 1.6 Hz), 5.18 (s, 2H), 5.04 (s, 2H), 3.22 (s, 3H)

Elemental analysis as C₂₁H₂₀N₄O₄

Calcd.: C, 64.28; H, 5.14; N, 14.28.

Found: C, 64.09; H, 5.24; N, 14.43. Rf1: 0.50, Rf2: 0.86

Developing solvent for TLC:

-   -   Rf1 (ethyl acetate/n-hexane=1/2)     -   Rf2 (methanol/chloroform=2/98)

Elution time on HPLC: 28.9 mins.

Elution Conditions:

Column: Wakosil-II 5C18 HG (4.6×100 mm)

Eluant: Linear density gradient elution with eluants A/B=100/0-20/80, using eluant A: 0.1% TFA-water and eluant B: 0.1% TFA-containing acetonitrile (40 mins.)

Flow rate: 1.0 mL/min.

EXAMPLE 1 (Synthesis A): Production of des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Arg(Me)9,Trp 10]MS10 (Compound No. 796)

After 5 g (0.4 mmol/g) of Rink Amide MBHA resin commercially available was swollen in DMF, the resin was treated with 50 mL of 20% piperidine/DMF solution for 20 minutes to remove the Fmoc group. The resulting resin was washed with DMF and treated with 4.213 g (8 mmol) of Fmoc-Trp(Boc)-OH, 1.272 mL (8 mmol) of DIPCDI and 16 mL (8 mmol) of 0.5M HOAt/DMF solution at room temperature for 90 minutes, whereby Trp(Boc) was introduced to give the Fmoc-Trp(Boc)-Rink Amide MBHA resin. In a similar manner, Orn(Mtt) was introduced to give 2 mmol of the Fmoc-Orn(Mtt)-Trp(Boc)-Rink Amide MBHA resin. After the resin obtained was washed and swollen in DCM, 50 mL of TFA/TIS/DCM (1/5/94) was added thereto, followed by shaking for 10 minutes and removing the solution through filtration. This procedure was repeated until yellow color caused by free Mtt group in a TFA/TIS/DCM (1/5/94) solution disappeared when the solution was added; thus the Mtt group was removed. The resulting Fmoc-Orn-Trp(Boc)-Rink Amide MBHA resin was neutralized with 5%-DIEA/DCM solution. After washing with DCM, 25 mL of DCM-TFE (4:1) and 1.946 g (6 mmol) of N-methyl-N,N′-bis-Boc-1-guanylpyrazole obtained in REFERENCE EXAMPLE 1 were added to the resin. DIEA was added to the mixture to adjust pH of the resulting solution to 10. The solution was shaken for 15 hours to give 6.195 g of Fmoc-Arg(Boc₂,Me)-Trp(Boc)-Rink Amide MBHA resin. Fmoc-Leu was introduced into the obtained resin as in the manner described above. In the Fmoc-Leu-Arg(Boc₂,Me)-Trp(Boc)-Rink Amide MBHA resin obtained, 859 mg (0.25 mmol) of the resin was used as a starting material, which was reacted on an ABI 433A (Fmoc/DCC/HOBt 0.25 mmol protocol) to introduce Gly, Phe, Thr(Bu^(t)), Asn(Trt), Hyp(Bu^(t)) and D-Tyr(Bu^(t)) in this order. Thus, H-D-Tyr(Bu^(t))-Hyp(Bu^(t))-Asn(Trt)-Thr(Bu^(t))-Phe-Gly-Leu-Arg(Boc₂,Me)-Trp(Boc)-Rink Amide MBHA resin was obtained. Subsequently, the resin was treated for 20 minutes in DMF with 94.4 μl (1 mmol) of Ac₂O and 174.2 μl (1 mmol) of DIEA for N-terminal acetylation to give Ac-D-Tyr(Bu^(t))-Hyp(Bu^(t))-Asn(Trt)-Thr(Bu^(t))-Phe-Gly-Leu-Arg(Boc₂,Me)-Trp(Boc)-Rink Amide MBHA resin. To the resin obtained, 6 mL of TFA/PhSMe/m-cresol/H₂O/TIS/EDT (80/5/5/5/2.5/2.5) was added, followed by stirring for 90 minutes. Diethyl ether was added to the reaction solution, the resulting precipitate was centrifuged, and the supernatant was then removed. This procedure was repeated twice. After washing, the residue was extracted with an aqueous acetic acid solution and the resin was removed by filtration. Then, linear density gradient elution (60 minutes) to A/B: 74/26-64/36 was performed at a flow rate of 15 mL/min using: eluant A: 0.1% TFA-water and eluant B: 0.1% TFA-containing acetonitrile on preparative HPLC using YMC Pack R&D-ODS-5-B S-5, 120A column (30×250 mm). The fractions containing the product were collected and lyophilized. The obtained white powders, 114.6 mg, were dissolved in 100 mL of water and 390 μL of ion exchange resin BioRAD AGI×8 AcO⁻ form was added to the solution, followed by stirring for an hour. The resin was removed by cotton plug filtration through silica wool, the same amount of the resin was again added and the mixture was stirred for an hour. The solution was filtered through a membrane filter to remove the resin and lyophilized to give 93.4 mg of white powders as the acetate.

Mass spectrum (M+H)⁺ 1224.6 (calcd. 1224.6).

Elution time on HPLC: 11.8 mins.

Elution Conditions:

Column: YMC ODS-AM301 (4.6×100 mm)

Eluant: Linear density gradient elution with eluants A/B=80/20-30/70, using eluant A: 0.1% TFA-water and eluant B: 0.1% TFA-containing acetonitrile (25 mins.)

Flow rate: 1.0 mL/min.

Amino acid analysis (20% hydrochloric acid containing 4% thioglycolic acid, 110° C., hydrolysis for 24 hours; figures in parentheses show theoretical values.): Asp 0.98 (1); Thr 0.95 (1); Gly 0.99 (1); Leu 0.99 (1); Tyr 0.98 (1); Phe 1.00 (1)

EXAMPLE 2 (Synthesis B): Production of des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Phe6Ψ(CH₂O)Gly7,Arg(Me)9,Trp 10]MS10 (Compound No. 834)

After 1.80 g of Z-Phe was dissolved in 20 mL of MeOH, 73 mg of DMAP, 1.38 g of WSCD HCl were added at 0° C., followed by stirring at 4° C. for 12 hours. The solvent was concentrated and the concentrate was dissolved in AcOEt, followed by washing with 1N HCl aq., satd. NaHCO₃ aq., and satd. NaCl aq. After drying over Na₂SO₄, the solvent was concentrated to give Z-Phe-OMe as oil. After dissolving in 20 mL of dry THF, 196 mg of LiBH₄ was added thereto and the mixture was stirred at room temperature for 15 hours. The solvent was concentrated and the concentrate was dissolved in AcOEt and the residue was washed with 1N HCl aq., satd. NaHCO₃ aq., and satd. NaCl aq. After drying over Na₂SO₄, the solvent was concentrated and ether-petroleum ether was added to give 1.45 g (yield 85%) of Z-Phe-ol as precipitates. After 60 mg of 60% NaH was suspended in 10 mL of dry THF, 285 mg of Z-Phe-ol, 264 mg of 18-crown-6 and 1.48 mL of tert-butyl bromoacetate were added at 0° C. While returning to room temperature, the mixture was stirred for 15 hours.

After the solvent was removed by distillation under reduced pressure, the residue was dissolved in AcOEt and then washed with 1N HCl aq., satd. NaHCO₃ aq. and satd. NaCl aq. After drying over Na₂SO₄, the solvent was concentrated and the concentrate was purified by flash column chromatography to give 217 mg (yield 54%) of Z-PheΨ(CH₂O)Gly-OBu^(t) as oil. After 160 mg of Z-PheΨ(CH₂O)Gly-OBu^(t) was dissolved in 20 mL of MeOH, 10% Pd-C was added, followed by catalytic hydrogenation for 3 hours in a hydrogen flow. The catalyst was removed by filtration and the solvent was concentrated to dryness. The residue was dissolved in 15 mL of DCM and 114 mg of Fmoc-Cl and 139 μL of DIEA were added. The mixture was stirred for 12 hours. After the solvent was removed by distillation, the residue was dissolved in AcOEt and the solution was washed with 1N HCl aq., satd. NaHCO₃ aq. and satd. NaCl aq. After drying over Na₂SO₄, the solvent was concentrated and the concentrate was purified by flash column chromatography. Diethyl ether-petroleum ether was added to give 150 mg (yield 77%) of Fmoc-PheΨ(CH₂O)Gly-OBu^(t) as precipitates. Fmoc-Leu-Arg(Me, Boc₂)-Trp(Boc)-Rink Amide MBHA resin, 86 mg (25 μmol), obtained in EXAMPLE 1, 32 mg of Fmoc-PheΨ(CH₂O)Gly-OH (prepared by treating Fmoc-PheΨ(CH₂O)Gly-OBu^(t) with 50% TFA/DCM for an hour), 200 μL of 0.5M HOAt/DMF, 52 mg of PyBrop and 53 μL of DIEA were added and the mixture was shaken for 24 hours. The resin was washed and 5 mL of 20% piperidine/DMF was added thereto, followed by shaking room temperature for 30 minutes. After the resin was washed, Thr(Bu^(t)), Asn(Trt), Hyp(Bu^(t)) and D-Tyr(Bu^(t)) were sequentially introduced in this order on an ABI 433A (Fmoc/DCC/HOBt 0.25 mmol protocol) sequentially to give H-D-Tyr(Bu^(t))-Hyp(Bu^(t))-Asn(Trt)-Thr(Bu^(t))-PheΨ(CH₂O)Gly-Leu-Arg(Boc₂,Me)-Trp(Boc)-Rink Amide MBHA resin. Subsequently, the resin was treated in DMF with 9.4 μl (0.1 mmol) of Ac₂O and 17.4 μl (0.1 mmol) of DIEA for 20 minutes for N-terminal acetylation to give Ac-D-Tyr(Bu^(t))-Hyp(Bu^(t))-Asn(Trt)-Thr(Bu^(t))-PheΨ(CH₂O)Gly-Leu-Arg(Boc₂,Me)-Trp(Boc)-Rink Amide MBHA resin. To the resin obtained, 1 mL of TFA/PhSMe/m-cresol/H₂O/TIS/EDT (80/5/5/5/2.5/2.5) was added and the mixture was stirred for 90 minutes. Diethyl ether was added to the reaction solution to give the precipitates. The procedure of centrifugation followed by removing the supernatant was repeated twice for washing. The residue was extracted with an aqueous acetic acid solution. After the resin was removed by filtration, linear density gradient elution (60 minutes) to A/B: 75/25-65/35 was performed at a flow rate of 15 mL/min using: eluant A: 0.1% TFA-water and eluant B: 0.1% TFA-containing acetonitrile on preparative HPLC using YMC Pack R&D-ODS-5-B S-5, 120A column (30×250 mm). The fractions containing the product were collected and lyophilized. The obtained white powders, 2.5 mg, were dissolved in 100 mL of water and 10 μL of ion exchange resin BioRAD AGI×8 AcO- form was added thereto. The mixture was stirred for an hour. The solution was filtered through a membrane filter to remove the resin and lyophilized to give 2.0 mg of white powders as the acetate.

Mass spectrum (M+H)⁺ 1211.3 (calcd. 1211.6).

Elution time on HPLC: 19.4 mins.

Elution Conditions:

Column: Wakosil-II C18 HG (4.6×100 mm)

Eluant: Linear density gradient elution with eluants A/B=100/0-0/50, using eluant A: 0.1% TFA-water and eluant B: 0.1% TFA-containing acetonitrile (25 mins.)

Flow rate: 1.0 mL/min.

EXAMPLE 3 (Synthesis C): Production of des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Phe6Ψ(CH₂CH₂)Gly7,Arg(Me)9,Trp10]MS10 (Compound No. 850)

After 4.44 g (0.45 mmol/g) of Rink Amide MBHA resin commercially available was swollen in DMF, the resin was treated with 50 mL of 20% piperidine/DMF solution for 20 minutes to remove the Fmoc group. The resulting resin was washed with DMF and treated in DMF with 4.21 g (8 mmol) of Fmoc-Trp(Boc)-OH, 1.27 mL (8 mmol) of DIPCDI and 1.31 g (8 mmol) of HOOBt at room temperature for 90 minutes, whereby Trp(Boc) was introduced to give the Fmoc-Trp(Boc)-Rink Amide MBHA resin. In a similar manner, Orn(Mtt) was introduced to give 2 mmol of the Fmoc-Orn(Mtt)-Trp(Boc)-Rink Amide MBHA resin. After the resin obtained was washed and swollen in toluene, 30 mL of TFA/TIS/TFE/toluene (1/5/47/47) was added, followed by shaking for 30 minutes and removing the solution by filtration. This procedure was repeated until yellow color caused by free Mtt group in a TFA/TIS/TFE/toluene (1/5/47/47) solution disappeared when the solution was added; thus the Mtt group was removed. The resulting Fmoc-Orn-Trp(Boc)-Rink Amide MBHA resin was neutralized with 5%-DIEA/toluene solution. After washing with toluene, 15 mL of toluene-TFE (4:1) and 1.95 g (6 mmol) of N-methyl-N,N′-bis-Boc-1-guanylpyrazole obtained in REFERENCE EXAMPLE 1 were added to the resin. DIEA was added to the mixture to adjust pH of the solution to 10. The solution was shaken for 15 hours to give Fmoc-Arg(Boc₂,Me)-Trp(Boc)-Rink Amide MBHA resin (2 mmol). After the resin obtained was dried in MeOH, 0.03 mmol was weighed and reswollen in DMF. Leu was introduced in the same manner as described above to give 0.03 mmol of Fmoc-Leu-Arg(Boc₂,Me)-Trp(Boc)-Rink Amide MBHA resin. After Fmoc deprotection in 20% piperidine/DMF solution, the resin was treated in DMF with 51.5 mg (0.12 mmol) of Fmoc-Phe-Ψ(CH₂CH₂)-Gly-OH obtained in REFERENCE EXAMPLE 3, 19.1 μl (0.12 mmol) of DIPCDI and 240 μl of 0.5 M HOAt/DMF solution at room temperature for 150 minutes. The resin was washed with DMF and then treated with 10.9 μl of (0.12 mmol) of Ac₂O and 20.9 μl (0.12 mmol) of DIEA for capping of residual amino groups. Subsequently, the resin was shaken overnight in 2 mL of DMF solution of Ac-D-Tyr-Hyp-Asn-Thr-OH (0.06 mmol) synthesized in a conventional manner of the liquid-phase process, 31.2 mg (0.06 mmol) of PyAOP, 120 μl (0.06 mmol) of 0.5 M HOAt/DMF solution and 10.5 μl (0.06 mmol) of DIEA to give Ac-D-Tyr-Hyp-Asn-Thr-Phe-Ψ(CH₂CH₂)-Gly-Leu-Arg(Boc₂,Me)-Trp(Boc)-Rink Amide MBHA resin. After drying, 1.5 mL of TFA/PhSMe/m-cresol/H₂O/TIS/EDT (80/5/5/5/2.5/2.5) was added to the resin and stirred for 90 minutes.

Diethyl ether was added to each reaction solution to give the precipitate and after centrifugation, the supernatant was removed; this procedure was repeated twice for washing. The residue was extracted with an aqueous acetic acid solution and the extract was filtered to remove the resin. Thereafter, linear density gradient elution (60 minutes) to A/B: 71.5/28.5-61.5/38.5 was performed at a flow rate of 15 mL/min using eluant A: 0.1% TFA-water and eluant B: 0.1% TFA-containing acetonitrile on preparative HPLC using YMC Pack R&D-ODS-5-B S-5, 120A column (30×250 mm). The fractions containing the product were collected and lyophilized to give 5.5 mg of white powders.

Mass spectrum (M+H)⁺ 1209.7 (calcd. 1209.6).

Elution time on HPLC: 12.2 mins.

Elution Conditions:

Column: SHISEIDO CAPCELLPAK C18 MGII (4.6×100 mm)

Eluant: Linear density gradient elution with eluants A/B=80/20-30/70, using eluant A: 0.1% TFA-water and eluant B: 0.1% TFA-containing acetonitrile (25 mins.)

Flow rate: 1.0 mL/min.

REFERENCE EXAMPLE 3 Synthesis of Fmoc-Phe-Ψ(CH₂CH₂)-Gly-OH

After 97.4 mg (0.269 mmol) of Boc-Phe-Ψ[(E)CH═CH]-Gly-OBu^(t), which is a compound known by the literature, was dissolved in 10 mL of AcOEt, 10 mg of 10% Pd/C was added and the mixture was stirred in a hydrogen gas flow at room temperature for 4 hours. The Pd catalyst was removed by filtration through celite, and the filtrate was concentrated under reduced pressure. Subsequently, the residue was dissolved in 4 mL of TFA and the solution was stirred at room temperature for 2 hours. TFA was distilled off under reduced pressure and the residue was dissolved in 2.25 mL of acetonitrile:H₂O (2:1). Under ice cooling, acetonitrile (3 mL) solution of 236 μL (1.69 mmol) of TEA and 95.1 mg (0.282 mmol) of Fmoc-OSu was dropwise added sequentially and the mixture was stirred at the same temperature for 2 hours. After 20 mL of 0.1N HCl aq. was added, the whole was extracted with AcOEt. The organic layer was washed twice with 0.1 N HCl aq. and then dried over anhydrous MgSO₄. After concentrating under reduced pressure, the product was purified by flash column chromatography (ethyl acetate/n-hexane=3/2) using Wakosil C-300 to give 118 mg (quantitative) of Fmoc-Phe-Ψ(CH₂CH₂)-Gly-OH.

EXAMPLE 4 (Synthesis D): Production of des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Phe6T(COCH₂)Gly7,Arg(Me)9,Trp 10]MS10 (Compound No. 851)

Using as a starting material Boc-Phe-Ψ(COCH₂)-Gly-OBu^(t) which is a compound known by the literature, Fmoc-Phe-Ψ(COCH₂)-Gly-OH synthesized according to REFERENCE EXAMPLE 3 as a raw material was treated in a manner similar to REFERENCE EXAMPLE 3 to give Ac-D-Tyr-Hyp-Asn-Thr-Phe-Ψ(COCH₂)-Gly-Leu-Arg(Boc₂,Me)-Trp(Boc)-Rink Amide MBHA resin. After drying the resin, 1.5 mL of TFA/PhSMe/m-cresol/H₂O/TIS (80/5/5/5/5) was added and the mixture was stirred for 90 minutes. Diethyl ether was added to each reaction solution to give the precipitate and after centrifugation, the supernatant was removed; this procedure was repeated twice for washing. The residue was extracted with an aqueous acetic acid solution and the extract was filtered to remove the resin. Then, linear density gradient elution (60 minutes) to A/B: 72.5/27.5-62.5/37.5 was performed at a flow rate of 15 mL/min using eluant A: 0.1% TFA-water and eluant B: 0.1% TFA-containing acetonitrile on preparative HPLC using YMC Pack R&D-ODS-5-B S-5, 120A column (30×250 mm). The fractions containing the product were collected and lyophilized to give 4.0 mg of white powders.

Mass spectrum (M+H)⁺ 1224.2 (calcd. 1223.6).

Elution time on HPLC: 11.8 mins.

Elution Conditions:

Column: SHISEIDO CAPCELLPAK C18 MGII (4.6×100 mm)

Eluant: Linear density gradient elution with eluants A/B=80/20-30/70, using eluant A: 0.1% TFA-water and eluant B: 0.1% TFA-containing acetonitrile (25 mins.)

Flow rate: 1.0 mL/min.

EXAMPLE 5 (Synthesis E): Production of des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Gly7Ψ(CH₂NH)Leu8,Arg(Me)9,Trp10]MS10 (Compound No. 854)

Fmoc-Gly-OH, 1 g (3.36 mmol), 361.0 mg (3.70 mmol) of CH₃ONHCH₃ and 447.3 mg (3.53 mmol) of HOBt were dissolved in DMF. Under ice cooling, 677 mg (3.53 mmol) of WSCI.HCl and 1.94 mL (11.1 mmol) of DIEA were added to the solution, followed by stirring overnight. After the reaction solution was concentrated, 10% aqueous citric acid solution was added and the precipitated solid was extracted with AcOEt. The organic layer was washed with 10% aqueous citric acid solution, 5% NaHCO₃ aqueous solution and satd. sodium chloride aqueous solution, and dried over anhydrous Na₂SO₄. The oily Fmoc-Gly-N(CH₃)OCH₃ product obtained by concentrating the solvent was dissolved in THF. Under ice cooling, 332 mg (0.726 mmol) of LiAlH₄ was added by small portions to the solution over 15 minutes. After stirring at 0° C. for 30 minutes, 150 mL of diethyl ether and 150 mL of 20% citric acid aqueous solution were sequentially added to the reaction solution, which was then vigorously stirred for an hour. The organic layers were collected and the aqueous layer was again extracted with 150 mL of diethyl ether. The pooled organic layer was washed sequentially with 5% NaHCO₃ aqueous solution, water, 10% citric acid aqueous solution, water and then satd. sodium chloride aqueous solution, and dried over anhydrous Na₂SO₄. The organic layer obtained was concentrated to give Fmoc-Gly-al as an oily substance.

After removal of the N-terminal Fmoc group in (0.291 mmol/g) 171.8 mg (0.05 mmol) of Fmoc-Leu-Arg(Boc₂,Me)-Trp(Boc)-Rink Amide MBHA resin, 56.2 mg (0.2 mmol) of Fmoc-Gly-al dissolved in DMF and 50 μl of AcOH were added and the mixture was stirred for 10 minutes. Subsequently, 12.3 mg (0.2 mmol) of NaBH₃CN was added and the mixture was stirred overnight. The reaction process was monitored by Kaiser test and found not to be sufficient. The coupling was performed again. After completion of the reaction, capping of the unreacted amino groups and protection of the reducing amino moieties were effected by treating with 107.7 mg (0.5 mmol) of Boc-OSu and 87.1 μl (0.5 mmol) of DIEA. Phe, Thr(Bu^(t)), Asn(Trt), Hyp(Bu^(t)) and D-Tyr(Bu^(t)) were introduced on the resin obtained using an ABI peptide synthesizer. Subsequently, the N-terminal amino group was treated with 9.5 μl (0.1 mmol) of Ac₂O and 17.4 μl (0.1 mmol) of DIEA in DMF for 20 minutes for acetylation. The resin was then washed and dried to give 162.3 mg of Ac-D-Tyr-Hyp-Asn-Thr-Phe-GlyΨ(CH₂NH)Leu-Arg(Boc₂,Me)-Trp(Boc)-Rink Amide MBHA resin. After the resin was dried, 1 mL of TFA/PhSMe/m-cresol/H₂O/TIS/EDT (80/5/5/5/2.5/2.5) was added and the mixture was stirred for 90 minutes. Diethyl ether was added to each reaction solution to give the precipitate and after centrifugation, the supernatant was removed; this procedure was repeated twice for washing. The residue was extracted with an aqueous acetic acid solution and the extract was filtered to remove the resin. Thereafter, linear density gradient elution (60 minutes) to A/B: 77/23-67/33 was performed at a flow rate of 15 mL/min using eluant A: 0.1% TFA-water and eluant B: 0.1% TFA-containing acetonitrile on preparative HPLC using Daisopak-SP100-5-ODS-P 2×25 cm, 120A column (20×250 mm). The fractions containing the product were collected and lyophilized to give 0.6 mg of white powders.

Mass spectrum (M+H)⁺ 1210.6 (calcd. 1210.6).

Elution time on HPLC: 10.9 mins.

Elution Conditions:

Column: SHISEIDO CAPCELL PAK C18 MGII (4.6×100 mm)

Eluant: Linear density gradient elution with eluants A/B=80/20-30/70, using eluant A: 0.1% TFA-water and eluant B: 0.1% TFA-containing acetonitrile (25 mins.)

Flow rate: 1.0 mL/min.

EXAMPLE 6 (Synthesis F): Production of des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Phe6Ψ[(S)CHOH-CH₂]Gly7,Arg(Me)9,Trp 10]MS10 (Compound No. 857)

10% Pd/C (3 mg) was added to a MeOH (3 mL) solution of Compound 858 (1.02 mg) synthesized as in EXAMPLE 3. After stirring in a hydrogen gas flow for 6 hours, the mixture was settled overnight in a hydrogen atmosphere. After Pd/C was removed by filtration, linear density gradient elution (60 minutes) to A/B: 72/28-62/38 was performed at a flow rate of 15 mL/min using eluant A: 0.1% TFA-water and eluant B: 0.1% TFA-containing acetonitrile on preparative HPLC using YMC Pack R&D-ODS-5-B S-5, 120A column (30×250 mm). The fractions containing the product were collected and lyophilized to give 0.3 mg of white powders.

Mass spectrum (M+H)⁺ 1226.2 (calcd. 1225.6).

Elution time on HPLC: 11.9 mins.

Elution Conditions:

Column: SHISEIDO CAPCELL PAK C18 MGII (4.6×100 mm)

Eluant: Linear density gradient elution with eluants A/B=80/20-30/70, using eluant A: 0.1% TFA-water and eluant B: 0.1% TFA-containing acetonitrile (25 mins.)

Flow rate: 1.0 mL/min.

EXAMPLE 7 (Synthesis G): Production of des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Gly7Ψ((E)CH═CH)Leu8,Arg(Me)9,Trp10]MS10 (Compound No. 892)

HCl.H-Ser-OMe, 3.5 g (22.6 mmol), was suspended in (40 mL) of chloroform. Under ice cooling, DIEA (8.7 mL, 49.7 mmol) and Pbf-Cl (5.86 g, 20.3 mmol) were sequentially added and stirred overnight while gradually elevating to room temperature. After the reaction was stopped by adding satd. citric acid aqueous solution, chloroform was distilled off under reduced pressure and the whole was extracted with AcOEt. The organic layer was washed sequentially with satd. citric acid aqueous solution, satd. sodium bicarbonate aqueous solution and satd. sodium chloride aqueous solution, and then dried over anhydrous MgSO₄. After concentration under reduced pressure, flash chromatography was performed using AcOEt:n-hexane=1:1 to give Pbf-Ser-OMe (6.94 g, 82.7%).

In an argon atmosphere under ice cooling, 923 μl (2.03 mmol) of a toluene solution of 2.2 M diethyl azodicarboxylate was added to a solution of 500 mg (1.35 mmol) of Pbf-Ser-OMe, 522 mg (2.03 mmol) of PPh₃ in THF (20 mL). The mixture was stirred overnight at room temperature and then THF was distilled off under reduced pressure. Flash chromatography was performed using AcOEt:n-hexane=1:1 to give 481 mg of aziridine methyl ester (quantitative).

In an argon atmosphere, 429 μl (0.644 mmol) of a toluene solution of 1.5 M DIBAL-H was dropwise added to a toluene (10 mL) solution of aziridine methyl ester (198 mg, 0.56 mmol) at −78° C. After stirring for 20 minutes at the same temperature, the reaction was stopped with 0.1 N HCl aqueous solution. The whole was extracted with diethyl ether and the organic layer was washed sequentially with 0.1 N HCl aqueous solution and satd. sodium chloride aqueous solution. After drying over anhydrous MgSO₄, the reaction mixture was concentrated under reduced pressure to give the aldehyde as an oily substance. On the other hand, 146 μL (0.84 mmol) of DIEA and 197 μL (0.84 mmol) of (EtO)₂P(O)CH₂CO₂Bu^(t) were sequentially added under ice cooling, to a suspension of 35.6 mg (0.84 mmol) of anhydrous LiCl in acetonitrile (2 mL). The mixture was stirred at the same temperature for 20 minutes and then an acetonitrile (4 mL) solution of the aldehyde obtained above was dropwise added thereto, followed by stirring at 0° C. for 3 hours. After the whole was extracted with AcOEt, the organic layer was washed sequentially with satd. citric acid aqueous solution, satd. sodium bicarbonate aqueous solution and satd. sodium chloride aqueous solution, and then dried over anhydrous MgSO₄. The mixture was concentrated under reduced pressure and the concentrate was recrystallized from diethyl ether/n-hexane to give 86.5 mg of the objective aziridine enoate. The mother liquor was concentrated under reduced pressure and subjected to flash chromatography using AcOEt:n-hexane=1:19 to give additional 82.4 mg of the objective aziridine enoate (total yield: 71.5%).

In an argon atmosphere, 1.59 mL (3.17 mmol) of a 2.0 M THF solution of i-BuMgCl was dropwise added at −78° C. to an anhydrous THF (6 mL) solution of 284 mg (3.17 mmol) of CuCN and 269 mg (6.34 mmol) of anhydrous LiCl. The temperature was elevated to 0° C. and the mixture was stirred for 10 minutes. The mixture was again cooled to −78° C., and 402 μL (3.17 mmol) of BF₃.Et₂O and an anhydrous THF (6 mL) solution of 334 mg (0.792 mmol) of aziridine enoate were dropwise added sequentially. The mixture was stirred at the same temperature for 20 minutes. After quenching with satd. Ammonium chloride aqueous solution: 28% ammonia aqueous solution (1:1), the mixture was stirred at room temperature until the reaction solution turned blue. The whole was extracted with diethyl ether. The organic layer was washed with water and dried over anhydrous MgSO₄. After concentration under reduced pressure, the residue was dissolved in 95% TFA aqueous solution (10 mL) and stirred at room temperature for 3 hours. TFA was removed by distillation under reduced pressure and azeotropically distilled off twice with diethyl ether. The residue was recrystallized from diethyl ether/n-hexane to give 254 mg of Pbf-GlyΨ[(E)-CH═CH]Leu-OH as white powders (75.7%).

After 180 mg (0.425 mmol) of Pbf-GlyΨ[(E)-CH═CH]Leu-OH and 352 μL (3 mmol) of thioanisole were dissolved in TFA (2.65 mL), the solution was stirred at room temperature for 24 hours. TFA was distilled off under reduced pressure and the resulting residue was dissolved in acetonitrile:H₂O (2:1, 9 mL). Under ice cooling, triethylamine was added until the solution became basis and 168 mg (0.446 mmol) of Fmoc-OSu was further added thereto. While elevating to room temperature, the mixture was stirred for 4 hours and the whole was extracted with AcOEt. The organic layer was washed sequentially with 0.1 N HCl aqueous solution and satd. Sodium chloride aqueous solution, and dried over anhydrous MgSO₄. Following concentration under reduced pressure, flash chromatography using AcOEt:n-hexane=3.5:6.5 was performed to give 145 mg of Fmoc-GlyΨ[(E)-CH═CH]Leu-OH (89%).

After 287 mg (0.1 mmol) of Fmoc-Arg(Boc₂,Me)-Trp(Boc)-Rink Amide MBHA resin (0.349 mmol/g) was swollen in DMF, the mixture was treated with 20% piperidine/DMF solution to cleave the Fmoc group. Subsequently, the resin was treated in DMF with 133 mg (0.338 mmol) of Fmoc-GlyΨ[(E)-CH═CH]Leu-OH, 58.9 μl (0.338 mmol) of DIEA, 676 μl (0.338 mmol) of 0.5 M HOAt/DMF solution and 176 mg (0.338 mmol) of PyAOP at room temperature for 12 hours. After the resin was washed with DMF, the N-terminal peptide was extended by the Fmoc solid-phase synthesis to give Ac-D-Tyr(Bu^(t))-Hyp(OBu^(t))-Asn(Trt)-Thr(Bu^(t))-Phe-GlyΨ[(E)CH═CH]Leu-Arg(Boc₂ μM e)-Trp(Boc)-Rink Amide MBHA resin. After the resin was dried, 4 mL of TFA/PhSMe/m-cresol/H₂O/TIS/EDT (80/5/5/5/2.5/2.5) was added thereto and the mixture was stirred for 180 minutes. Diethyl ether was added to each reaction solution to give the precipitate and after centrifugation, the supernatant was removed; this procedure was repeated twice for washing. The residue was extracted with an aqueous acetic acid solution and the extract was filtered to remove the resin. Thereafter, linear density gradient elution (60 minutes) to A/B: 71.5/28.5-61.5/38.5 was performed at a flow rate of 15 mL/min using eluant A: 0.1% TFA-water and eluant B: 0.1% TFA-containing acetonitrile on preparative HPLC using YMC Pack R&D-ODS-5-B S-5, 120A column (30×250 mm). The fractions containing the product were collected and lyophilized to give 19.6 mg of white powders.

Mass spectrum (M+H)⁺ 1207.5 (calcd. 1207.6).

Elution time on HPLC: 14.6 mins.

Elution Conditions:

Column: SHISEIDO CAPCELL PAK C18 MGII (4.6×100 mm)

Eluant: Linear density gradient elution with eluants A/B=80/20-30/70, using eluant A: 0.1% TFA-water and eluant B: 0.1% TFA-containing acetonitrile (25 mins.)

Flow rate: 1.0 mL/min.

EXAMPLE 8 (Synthesis H): Production of des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Gly7Ψ(CH₂CH₂)Leu8,Arg(Me)9,Trp 10]MS10 (Compound No. 893)

After 9.9 mg of des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Gly7Ψ((E)CH═CH)Leu8,Arg(Me)9,Trp 10]MS10 (Compound No. 892) was dissolved in 4 mL of MeOH, 20 mg of 10% Pd/C was added to the solution and suspended therein. In a hydrogen atmosphere, the mixture was stirred for 9 hours and then the Pd catalyst was removed by filtration. MeOH was distilled off under reduced pressure. After the residue was dissolved in 1.5 μL of 50% AcOH aqueous solution, linear density gradient elution (60 minutes) to A/B: 72/28-62/38 was performed at a flow rate of 15 mL/min using eluant A: 0.1% TFA-water and eluant B: 0.1% TFA-containing acetonitrile on preparative HPLC using YMC Pack R&D-ODS-5-B S-5, 120A column (30×250 mm). The fractions containing the product were collected and lyophilized to give 4.1 mg of white powders.

Mass spectrum (M+H)⁺ 1209.1 (calcd. 1209.6).

Elution time on HPLC: 19.0 mins.

Elution Conditions:

Column: SHISEIDO CAPCELL PAK C18 MGII (4.6×100 mm)

Eluant: Linear density gradient elution with eluants A/B=195/5-45/55, using eluant A: 0.1% TFA-water and eluant B: 0.1% TFA-containing acetonitrile (25 mins.)

Flow rate: 1.0 mL/min.

EXAMPLE 9 Production of des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Cha6,Ala(cPr)8,Arg(Me)9,Trp 10]MS10 (Compound No. 894)

Fmoc-Arg(Me, Boc₂)-Trp(Boc)-Rink Amide MBHA resin, 2.744 g (0.952 mmol), was weighed and charged in a reaction vessel, washed with DMF and then stirred in DMF for 20 minutes to swell the resin. Following deprotection of the N-terminal Fmoc group by treating with 20% piperidine/DMF, the resin was treated with 669.1 mg (1.904 mmol) of Fmoc-Ala(cPr)-OH, 7.616 mL (3.808 mmol) of 0.5M HOAt/DMF solution and 0.454 mL (2.856 mmol) of DIPCDI for 150 minutes. After the resin was washed with DMF, the reaction process was monitored by the ninhydrin test and found not to be sufficient. Thus, the resin was again treated in DMF with 233.0 mg (0.663 mmol) of Fmoc-Ala(cPr)-OH, 1.989 mL (0.995 mmol) of 0.5M HOAt/DMF solution, 518.6 mg (0.995 mmol) of PyAOP and 0.578 mL (3.315 mmol) of DIEA for 60 hours to complete the reaction. Gly, Cha, Thr(Bu^(t)), Asn(Trt), Hyp(Bu^(t)) and D-Tyr(Bu^(t)) were introduced in this order into the obtained resin, by the Fmoc solid-phase synthesis using 4 mmol each of Fmoc-amino acid/DIPCDI/HOOBt. The N-terminal Fmoc group of Fmoc-D-Tyr(Bu^(t))-Hyp(Bu^(t))-Asn-Thr(Bu^(t))-Cha-Gly-Ala(cPr)-Arg(Me, Boc₂)-Trp(Boc)-Rink Amide MBHA resin obtained was deprotected by 20% piperidine/DMF treatment to remove the N-terminal Fmoc group of the resin obtained. Then, the resin was suspended in about 10 mL of DMF, and 377 μl (4 mmol) of Ac₂O and 697 μl (4 mmol) of DEA were added to the suspension. The mixture was stirred for 20 minutes. The resin was washed with DMF. After it was confirmed that the reaction proceeded, the resin was washed in MeOH and dried.

To 3.5004 g of the resulting resin, 35 mL of TFA:thioanisole:m-cresol:H₂O:EDT:TIS (80:5:5:5:2.5:2.5) was added and the mixture was stirred for 90 minutes at room temperature. While removing the resin by passing through a glass filter, the reaction solution was dropwise added to chilled ether with stirring to make the crude peptide white powders. The resin was thoroughly washed with a deprotection solution and then returned to the reaction solution. The resin was treated again with the same volume of the deprotection solution at room temperature for 20 hours and ether was likewise added dropwise to make the product white powders.

The mixture of white powders and ether was separated by centrifugation, respectively. The ether was removed by decantation and this procedure was repeated twice to remove the acid and scavenger. The residue was dried and extracted with acetic acid aqueous solution. The extract was passed through a 0.45 μm disk filter to remove fine particles, followed by concentration with an evaporator. The residue was diluted in acetonitrile-aqueous solution and lyophilized to give total 1.118 g of white to brown powders.

The crude peptide obtained was purified separately six times on preparative HPLC using SHISEIDO CAPCELL PAK MGII column (50×250 mm). Linear density gradient elution (60 minutes) to A/B: 72/28-62/38 was performed at a flow rate of 45 mL/min using eluant A: 0.1% TFA-water and eluant B: 0.1% TFA-containing acetonitrile on preparative HPLC. The product eluted out was fractionated in test tubes by about 14 mL each. By monitoring each fraction on HPLC, the fractions containing the product only were identified. The fractions were pooled and lyophilized to give 389.3 mg of white powders.

In AcCN-water, 389.3 mg (316.9 μmol) of the purified sample obtained was dissolved and 1.320 mL (1.585 mmol equivalent) of AG 1×8 AcO-resin was added to the solution. While occasionally stirring manually, the solution was settled for an hour, and filtered through a PTFE membrane filter having a 3 μm pore diameter. The filtrate was transferred to a recovery flask and the solvent was distilled off. Then, 3 mL of acetic acid was added to the residue. After the mixture was sonicated for 5 minutes with an ultrasonicator, 12 mL of water was added to the solution. While cooling on a dry ice bath, the resulting 20% acetic acid solution was lyophilized to give 368.6 mg of white powders.

Mass spectrum (M+H)⁺ 1228.9 (calcd. 1228.6).

Elution time on HPLC: 12.9 mins.

Elution Conditions:

Column: YMC ODS-AM301 (4.6×100 mm)

Eluant: Linear density gradient elution with eluants A/B=80/20-30/70, using eluant A: 0.1% TFA-water and eluant B: 0.1% TFA-containing acetonitrile (25 mins.)

Flow rate: 1.0 mL/min.

Amino acid analysis (20% hydrochloric acid containing 4% thioglycolic acid, 110° C., hydrolysis for 24 hours; figures in parentheses show theoretical values.): Asp 0.92 (1); Thr 0.89 (1); Gly 0.92 (1); Tyr 0.99 (1); Cha 1.00 (1)

EXAMPLE 10 Production of des(1)-Ac-[D-Tyr2,Hyp3,Alb4,Thr5,Cha6,Gly7Ψ((E)CH═CH)Leu8,Arg(Me)9,Trp 10]MS10 (Compound No. 903)

After 4.32 g (1.5 mmol) of Fmoc-Arg(Boc₂,Me)-Trp(Boc)-Rink Amide MBHA resin (0.347 mmol/g) was equally divided into three and swollen in DMF, the mixture was treated with 20% piperidine/DMF solution to cleave the Fmoc group. Subsequently, each resin was treated in DMF with 590 mg (1.5 mmol) of Fmoc-GlyΨ[(E)-CH═CH]Leu-OH, 261 μl (1.5 mmol) of DIEA, 3.0 ml (1.5 mmol) of 0.5 M HOAt/DMF solution and 782 mg (1.5 mmol) of PyAOP at room temperature for 12 hours. After the resin was washed with DMF and combined, Cha, Thr(Bu^(t)), Alb, Hyp(Bu^(t)) and D-Tyr(Bu^(t)) were introduced in this order into the obtained resin, by the Fmoc solid-phase synthesis using Fmoc-amino acid/DIPCDI/HOAt to give Fmoc-D-Tyr(Bu^(t))-Hyp(OBu^(t))-Asn(Trt)-Thr(Bu^(t))-Cha-GlyΨ[(E)CH═CH]Leu-Arg(Boc₂,Me)-Trp(Boc)-Rink Amide MBHA resin. The resin thus obtained was deprotected by 20% piperidine/DMF treatment, and washed. The resin was then suspended in DMF, and 548 μl (6.0 mmol) of Ac₂O and 1.04 ml (6.0 mmol) of DIEA were added, respectively, followed by stirring for 20 minutes. The resin was washed with DMF. After it was confirmed that the reaction proceeded, the resin was washed in MeOH and dried to give Ac-D-Tyr(Bu^(t))-Hyp(Bu^(t))-Alb-Thr(Bu^(t))-Cha-GlyΨ[(E)CH═CH]Leu-Arg(Boc₂,Me)-Trp (Boc)-Rink Amide MBHA resin. The resulting resin was divided into 1 g, 2 g and 2.2 g, to which 25 mL, 50 mL and 50 mL of TFA:thioanisole:m-cresol:H₂O:EDT:TIS (80:5:5:5:2.5:2.5) were added, respectively. After stirring for 180 minutes at room temperature, the reaction solution was dropwise added onto chilled ether while removing the resin by passing through a glass filter, thereby to make the crude peptide white powders. The crude peptide obtained was purified separately 10 times on preparative HPLC using SHISEIDO CAPCELL PAK MGII column (50×250 mm). Linear density gradient elution (60 minutes) to A/B: 68/32-58/42 was performed at a flow rate of 45 mL/min using eluant A: 0.1% TFA-water and eluant B: 0.1% TFA-containing acetonitrile on preparative HPLC. The product eluted out was fractionated in test tubes by about 14 mL each. By monitoring each fraction on HPLC, the fractions containing the product only were identified. The fractions were pooled and lyophilized to give 352.2 mg of white powders.

In AcCN-water, 352.2 mg (286.7 μmol) of the purified sample obtained was dissolved and 1.195 mL (1.433 mmol equivalent) of AG 1×8 AcO-resin was added to the solution. While occasionally stirring manually, the solution was settled for an hour, and filtered through a PTFE membrane filter having a 3 μm pore diameter. The filtrate was transferred to a recovery flask and the solvent was distilled off. Then, 3 mL of acetic acid was added to the residue. After the mixture was sonicated for 5 minutes with an ultrasonicator, 12 mL of water was added to the solution. While cooling on a dry ice bath, the resulting 20% acetic acid solution was lyophilized to give 321.8 mg of white powders.

Mass spectrum (M+H)⁺ 1228.4 (calcd. 1228.7).

Elution time on HPLC: 20.2 mins.

Elution Conditions:

Column: SHISEIDO CAPCELL PAK C18 MGII (4.6×100 mm)

Eluant: Linear density gradient elution with eluants A/B=95/5-45/55, using eluant A: 0.1% TFA-water and eluant B: 0.1% TFA-containing acetonitrile (25 mins.)

Flow rate: 1.0 mL/min.

Amino acid analysis (20% hydrochloric acid containing 4% thioglycolic acid, 110° C., hydrolysis for 24 hours; figures in parentheses show theoretical values.): Thr 0.95 (1); Tyr 0.95 (1); Cha 1.00 (1)

EXAMPLE 11 Production of des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Cha6,Gly7Ψ((E)CH═CH)Leu8,Trp 10]MS10 (Compound No. 926)

Using as a starting material 3.33 g (1.5 mmol) of Fmoc-Rink Amide MBHA resin (0.45 mmol/g), the Fmoc solid-phase synthesis was carried out to give Fmoc-Arg(Pbf)-Trp(Boc)-Rink Amide MBHA resin. After Fmoc-Arg(Pbf)-Trp(Boc)-Rink Amide MBHA resin was swollen in DMF, the mixture was treated with 20% piperidine/DMF solution to cleave the Fmoc group. Subsequently, the resin was treated in DMF with 1.57 g (4.0 mmol) of Fmoc-GlyΨ[(E)-CH═CH]Leu-OH, 1.39 ml (8.0 mmol) of DIEA, 8.0 ml (4.0 mmol) of 0.5 M HOAt/DMF solution and 2.09 g (4.0 mmol) of PyAOP at room temperature for 24 hours. After the resin was washed with DMF, the N-terminal peptide was extended by the Fmoc solid-phase synthesis to give Fmoc-Cha-GlyΨ[(E)CH═CH]Leu-Arg(Pbf)-Trp(Boc)-Rink Amide MBHA resin. After deprotection of the N-terminal Fmoc group by 20% piperidine/DMF treatment, the resin was treated in DMF with Ac-D-Tyr-Hyp-Asn-Thr-OH 2.48 g (4.5 mmol), 734 mg (4.5 mmol) of HOOBt and 716 mL (4.5 mmol) of DIPCDI for 60 hours. The resulting Ac-D-Tyr-Hyp-Asn-Thr-Cha-GlyΨ[(E)CH═CH]Leu-Arg(Pbf)-Trp(Boc)-Rink Amide MBHA resin was washed in MeOH and dried. To the whole of the resulting resin, 60 mL of TFA:thioanisole:m-cresol:H₂O:EDT:TIS (80:5:5:5:2.5:2.5) was added. After stirring for 90 minutes at room temperature, the reaction solution was dropwise added onto chilled ether while removing the resin by passing through a glass filter, thereby to make the crude peptide white powders.

The crude peptide obtained was purified separately five times on preparative HPLC using SHISEIDO CAPCELL PAK MGII column (50×250 mm). Linear density gradient elution (60 minutes) to A/B: 69/31-59/41 or 68/32-58/42 was performed at a flow rate of 45 mL/min using eluant A: 0.1% TFA-water and eluant B: 0.1% TFA-containing acetonitrile on preparative HPLC. The product eluted out was fractionated in test tubes by about 14 mL each. By monitoring each fraction on HPLC, the fractions containing the product only were identified. The fractions were pooled and lyophilized to give white powders.

The whole was dissolved in acetonitrile-water and 0.824 mL (1.005 mmol equivalent) of AG 1×8 AcO⁻ resin was added to the solution. While occasionally stirring manually, the solution was settled for an hour, and filtered through a PTFE membrane filter having a 3 μm pore diameter. The filtrate was transferred to a recovery flask and the solvent was distilled off. Then, 2 mL of acetic acid was added to the residue. After the mixture was sonicated for 5 minutes with an ultrasonicator, 8 mL of water was added to the solution. While cooling on a dry ice bath, the resulting 20% acetic acid solution was lyophilized to give 304.7 mg of white powders. Mass spectrum (M+H)⁺ 1199.6 (calcd. 1199.7).

Elution time on HPLC: 20.2 mins.

Elution Conditions:

Column: SHISEIDO CAPCELL PAK C18 MGII (4.6×100 mm)

Eluant: Linear density gradient elution with eluants A/B=95/5-45/55, using eluant A: 0.1% TFA-water and eluant B: 0.1% TFA-containing acetonitrile (25 mins.)

Flow rate: 1.0 mL/min.

Amino acid analysis (20% hydrochloric acid containing 4% thioglycolic acid, 110° C., hydrolysis for 24 hours; figures in parentheses show theoretical values.): Asp: 0.93 (1); Thr 0.89 (1); Tyr 0.96 (1); Cha 1.00 (1); Arg 0.98 (1)

EXAMPLE 12 Production of des(1)-Ac-[D-Tyr2,Hyp3,Alb4,Thr5,Cha6,Gly7Ψ((E)CH═CH)Leu8,Trp 10]MS10 (Compound No. 927)

After 3.66 g (0.55 mmol) of Fmoc-Rink Amide MBHA resin was swollen in DMF, the peptide chain was extended by the Fmoc solid-phase synthesis. The N-terminal Fmoc group of. Fmoc-D-Tyr(Bu^(t))-Hyp(Bu^(t))-Alb-Thr(Bu^(t))-Cha-GlyΨ[(E)-CH═CH]Leu-Arg(Pbf)-Trp(Boc)-Rink Amide MBHA resin thus obtained was deprotected by 20% piperidine/DMF treatment, and washed. The resin was then suspended in about 10 mL of DMF, and 208 μl (2.2 mmol) of Ac₂O and 383 μl (2.2 mmol) of DIEA were added, respectively, followed by stirring for 20 minutes. The resin was washed with DMF. After it was confirmed that the reaction proceeded, the resin was washed in MeOH and dried.

To 5.9695 g of the resulting resin, 50 mL of TFA:thioanisole:m-cresol:H₂O:EDT:TIS (80:5:5:5:2.5:2.5) was added and the mixture was stirred for 90 minutes at room temperature. While removing the resin by passing through a glass filter, the reaction solution was dropwise added to chilled ether with stirring to make the crude peptide white powders. The resin was thoroughly washed with a deprotection solution and then returned to the reaction solution. The resin was treated again with the same volume of the deprotection solution at room temperature for 20 hours and ether was likewise added dropwise to make the product white powders.

The mixture of white powders and ether was separated by centrifugation, respectively. The ether was removed by decantation and this procedure was repeated twice to remove the acid and scavenger. The residue was dried and extracted with acetic acid aqueous solution. The extract was passed through a 0.45 μm disk filter to remove fine particles, followed by concentration with an evaporator. The residue was diluted in acetonitrile-aqueous solution and lyophilized to give total 1.646 g of white to brown powders.

The crude peptide obtained was purified separately six times on preparative HPLC using SHISEIDO CAPCELL PAK MGII column (50×250 mm). Linear density gradient elution (60 minutes) to A/B: 68/32-58/42 was performed at a flow rate of 45 mL/min using eluant A: 0.1% TFA-water and eluant B: 0.1% TFA-containing acetonitrile on preparative HPLC. The product eluted out was fractionated in test tubes by about 14 mL each. By monitoring each fraction on HPLC, the fractions containing the product only were identified. The fractions were pooled and lyophilized to give 436.9 mg of white powders.

In AcCN-water, 416.9 mg (343.3 mmol) of the purified sample obtained, and 1.430 mL (1.717 mmol equivalent) of AG 1×8 AcO⁻ resin was added to the solution. While occasionally stirring manually, the solution was settled for an hour, and filtered through a PTFE membrane filter having a 3 μm pore diameter. The filtrate was transferred to a recovery flask and the solvent was distilled off. Then, 4 mL of acetic acid was added to the residue. After the mixture was sonicated for 5 minutes with an ultrasonicator, 16 mL of water was added to the solution. While cooling on a dry ice bath, the resulting 20% acetic acid solution was lyophilized to give 368.4 mg of white powders.

Mass spectrum (M+H)⁺ 1214.6 (calcd. 1214.7).

Elution time on HPLC: 20.1 mins.

Elution Conditions:

Column: SHISEIDO CAPCELLPAK C18 MGII (4.6×100 mm)

Eluant: Linear density gradient elution with eluants A/B=95/5-45/55, using eluant A: 0.1% TFA-water and eluant B: 0.1% TFA-containing acetonitrile (25 mins.)

Flow rate: 1.0 mL/min.

Amino acid analysis (20% hydrochloric acid containing 4% thioglycolic acid, 110° C., hydrolysis for 24 hours, figures in parentheses show theoretical values.): Thr 0.95 (1); Tyr 0.97 (1); Cha 1.00 (1); Arg 0.99 (1)

EXAMPLE 13 (Synthesis I): Production of des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Gly7Ψ(CH₂S)Leu8,Arg(Me)9,Trp10]MS10 (Compound No. 929)

To a DCM (5 mL) solution of 289 mg (1.30 mmol) of benzyl L-leucinate, 2.1 mL (26 mmol) of pyridine and 1 mL (13 mmol) of methanesulfonylchloride were sequentially added at 0° C. After the mixture was stirred at the same temperature for 3 hours, satd. citric acid aqueous solution was added to stop the reaction. After the whole was extracted with AcOEt, the organic layer was washed sequentially with satd. citric acid aqueous solution, satd. sodium bicarbonate aqueous solution and satd. sodium chloride aqueous solution, and then dried over anhydrous MgSO₄. After concentration under reduced pressure, flash chromatography using AcOEt n-hexane=1:3 was applied to give 636 mg of the mesyloxy compound. The whole of the mesyloxy compound was dissolved in DMF (10 mL) and 535 mg (5.2 mmol) of NaBr was added. The mixture was heated for an hour while heating at 130° C. on an oil bath. After cooling, the whole was extracted with AcOEt and the organic layer was washed with satd. sodium chloride aqueous solution and dried over anhydrous MgSO₄. Following concentration under reduced pressure, flash chromatography was performed using AcOEt:n-hexane=1:15 to give 266 mg of the bromo compound (71.7%). To a DMF (2 mL) solution of 61 mg (0.214 mmol) of the bromo compound, 177 mg (1.28 mmol) of K₂CO₃ and 108 μL (0.642 mmol) of BocNHCH₂CH₂SH were added and the mixture was stirred overnight at room temperature. The whole was extracted with AcOEt. The organic layer was washed with satd. sodium chloride aqueous solution and dried over anhydrous MgSO₄. After concentration under reduced pressure, flash chromatography was performed using AcOEt:n-hexane=1:7 to give 75.1 mg of Boc-GlyΨ(CH₂S)Leu-OBzl as an oily substance (91.9%). In MeOH 75.1 mg (0.197 mmol) of Boc-GlyΨ(CH₂S)Leu-OBn was dissolved. It was attempted to remove the benzyl ester by treating the solution with HCONH₄ in the presence of Pd/C. Since the reaction proceeded only slightly, Pd/C was removed by filtration and the filtrate was extracted with AcOEt. The resulting residue was treated in MeOH (1 mL) with 394 μL (0.394 mmol) of 1M NaOH aqueous solution at room temperature for 2 days. The whole was extracted with AcOEt and the organic layer was washed and dried over anhydrous MgSO₄. The residue obtained after concentration under reduced pressure was dissolved in 3 mL of TFA, and the solution was stirred at room temperature for 2 hours. TFA was removed by distillation under reduced pressure and azeotropically distilled twice with toluene. The residue obtained was dissolved in acetonitrile:H₂O (2:1, 3 mL). Under ice cooling, Et₃N was added to the solution until the solution became basic, and 66.5 mg (0.446 mmol) of Fmoc-OSu was further added thereto. While elevating to room temperature, the mixture was stirred for 3 hours and then the whole was extracted with AcOEt. The organic layer was washed sequentially with 0.1 N HCl aqueous solution and satd. sodium chloride aqueous solution, and then dried over anhydrous MgSO₄. The residue, 72 mg, obtained after concentration under reduced pressure was used as Fmoc-GlyΨ(CH₂S)Leu-OH for the following step.

After 57.3 mg (0.02 mmol) of Fmoc-Arg(Boc₂,Me)-Trp(Boc)-Rink Amide MBHA resin (0.349 mmol/g) was swollen in DMF, the mixture was treated with 20% piperidine/DMF solution to cleave the Fmoc group. Subsequently, the resin was treated in DMF with 36 mg (0.0871 mmol) of Fmoc-GlyΨ(CH₂S)Leu-OH, 15.2 μl (0.0871 mmol) of DIEA, 174 μl (0.0871 mmol) of 0.5 M HOAt/DMF solution and 45.4 mg (0.0871 mmol) of PyAOP at room temperature for 12 hours. After the resin was washed with DMF, the peptide chain was extended by conducting condensation using 0.08 mmol each of Fmoc-Phe-OH, 0.5 M HOAt/DMF solution and DIPCDI and then 0.08 mmol each of Ac-D-Tyr-Hyp-Asn-Thr, PyAOP, 0.5 M HOAt/DMF solution and DIEA to give Ac-D-Tyr-Hyp-Asn-Thr-Phe-GlyΨ(CH₂S)Leu-Arg(Boc₂,Me)-Trp(Boc)-Rink Amide MBHA resin. After the resin was dried, 1.2 mL of TFA/PhSMe/m-cresol/H₂O/TIS/EDT (80/5/5/5/2.5/2.5) was added, followed by stirring for 180 minutes. Diethyl ether was added to each reaction solution to give the precipitate and after centrifugation, the supernatant was removed; this procedure was repeated twice for washing. The residue was extracted with an aqueous acetic acid solution and the extract was filtered to remove the resin. Thereafter, linear density gradient elution (60 minutes) to A/B: 72.5/27.5-62.5/37.5 was performed at a flow rate of 15 mL/min using eluant A: 0.1% TFA-water and eluant B: 0.1% TFA-containing acetonitrile on preparative HPLC using YMC Pack R&D-ODS-5-B S-5, 120A column (30×250 mm). The fractions containing the product were collected and lyophilized to give 2.7 mg of white powders.

Mass spectrum (M+H)⁺ 1227.0 (calcd. 1227.6)

Elution time on HPLC: 19.5 mins.

Elution Conditions:

Column: SHISEIDO CAPCELL PAK C18 MGII (4.6×100 mm)

Eluant: Linear density gradient elution with eluants A/B=95/5-45/55, using eluant A: 0.1% TFA-water and eluant B: 0.1% TFA-containing acetonitrile (25 mins.)

Flow rate: 1.0 mL/min.

EXAMPLE 14 (Synthesis J): Production of des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Phe6T(CH₂S)Gly7,Arg(Me)9,Trp 10]MS10 (Compound No. 944)

After 157 mg (0.597 mmol) of PPh₃ was added to a DCM (1.5 mL) solution of 100 mg (0.398 mmol) of Boc-Phe-ol and 165 mg (0.498 mmol) of CBr₄ at 0° C., the mixture was stirred at the same temperature for 2 hours. The solvent was distilled off under reduced pressure and the residue was purified by flash chromatography using AcOEt:n-hexane=1:10 to give 67 mg of the bromo compound as an oily substance (53.6%). To a DMF (1 mL) solution of 64 mg (0.204 mmol) of the bromo compound, 67.7 mg (0.49 mmol) of K₂CO₃ and 21.9 μL (0.245 mmol) of HSCH₂CO₂Me were added, followed by stirring at room temperature for 3 hours. The whole was extracted with AcOEt the organic layer was washed with satd. sodium chloride aqueous solution, and dried over anhydrous MgSO₄. After concentration under reduced pressure, flash chromatography was conducted using AcOEt:n-hexane=1:5 to give 51.5 mg of Boc-PheΨ(CH₂S)Gly-OMe as an oily substance (74.4%). In 1.2 mL of THF:MeOH (3:1), 51.5 mg (0.152 mmol) of Boc-PheΨ(CH₂S)Gly-OMe was dissolved and 600 μL of 1M NaOH aqueous solution was added, followed by stirring at room temperature for an hour. After 1M HCl aqueous solution was added to stop the reaction, the whole was extracted with AcOEt and the organic layer was washed with 1M HCl aqueous solution, dried over anhydrous MgSO₄ and concentrated under reduced pressure. The residue was dissolved in 1.2 mL of TFA, and the solution was stirred at room temperature for 2 hours. TFA was removed by distillation under reduced pressure and azeotropically distilled twice with toluene. The residue obtained was dissolved in acetonitrile:H₂O (2:1, 2.25 mL). Under ice cooling, Et₃N was added to the solution until the solution became basic, and 46.7 mg (0.152 mmol) of Fmoc-OSu was further added thereto. While elevating to room temperature, the mixture was stirred overnight and the whole was then extracted with AcOEt. The organic layer was washed sequentially with 0.1 N HCl aqueous solution and satd. sodium chloride aqueous solution, and then dried over anhydrous MgSO₄. The residue, 62.5 mg, obtained after concentration under reduced pressure was used as Fmoc-PheΨ(CH₂S)Gly-OH for the next step.

After 133 mg (0.045 mmol) of Fmoc-Arg(Boc₂,Me)-Trp(Boc)-Rink Amide MBHA resin (0.349 mmol/g) was swollen in DMF, the mixture was treated with 20% piperidine/DMF solution to cleave the Fmoc group. The resin was treated in DMF with 63.6 mg (0.18 mmol) of Fmoc-Leu-OH, 360 μl (0.18 mmol) of 0.5 M HOAt/DMF solution and 716 μL (0.18 mmol) of DIPCDI at room temperature for 1.5 hours. Subsequently, the resin was treated with 20% piperidine/DMF solution to cleave the Fmoc group. The resin was then treated in DMF with 62.5 mg (0.139 mmol) of Fmoc-PheΨ(CH₂S)Gly-OH, 24.2 μl (0.139 mmol) of DIEA, 278 μl (0.139 mmol) of 0.5 M HOAt/DMF solution and 72.5 mg (0.139 mmol) of PyAOP at room temperature for 12 hours. The resin was further treated with 20% piperidine/DMF solution to cleave the Fmoc group. The resin was then treated in DMF with 99.3 mg (0.18 mmol) of Ac-D-Tyr-Hyp-Asn-Thr-OH, 31.4 μl (0.18 mmol) of DIEA, 360 μl (0.18 mmol) of 0.5 M HOAt/DMF solution and 93.9 mg (0.18 mmol) of PyAOP at room temperature for 12 hours to give Ac-D-Tyr-Hyp-Asn-Thr-PheΨ(CH₂S)Gly-Leu-Arg(Boc₂,Me)-Trp(Boc)-Rink Amide MBHA resin. After the resin was dried, 1.5 mL of TFA/PhSMe/m-cresol/H₂O/TIS/EDT (80/5/5/5/2.5/2.5) was added, followed by stirring for 120 minutes. Diethyl ether was added to each reaction solution to give the precipitate and after centrifugation, the supernatant was removed; this procedure was repeated twice for washing. The residue was extracted with an aqueous acetic acid solution and the extract was filtered to remove the resin. Thereafter, linear density gradient elution (60 minutes) to A/B: 74/26-64/36 was performed at a flow rate of 15 mL/min using eluant A: 0.1% TFA-water and eluant B: 0.1% TFA-containing acetonitrile on preparative HPLC using YMC Pack R&D-ODS-5-B S-5, 120A column (30×250 mm). The fractions containing the product were collected and lyophilized to give 5.0 mg of white powders.

Mass spectrum (M+H)⁺ 1227.6 (calcd. 1227.6)

Elution time on HPLC: 19.0 mins.

Elution Conditions:

Column: SHISEIDO CAPCELLPAK C18 MGII (4.6×100 mm)

Eluant: Linear density gradient elution with eluants A/B=95/5-45/55, using eluant A: 0.1% TFA-water and eluant B: 0.1% TFA-containing acetonitrile (25 mins.)

Flow rate: 1.0 mL/min.

EXAMPLE 15 (Synthesis K): Production of des(1)-Ac-[D-Tyr2,Hyp3,Alb4,Thr5,Cha6,Gly7Ψ(CH₂CH₂)Leu8,Trp 10]MS10 (Compound No. 952)

After 15.7 mg of des(1)-Ac-[D-Tyr2,Hyp3,Alb4,Thr5,Cha6,Gly7Ψ((E)CH═CH)Leu8,Trp 10]MS10 (Compound No. 927) was dissolved in 3 mL of MeOH, 6.7 mg of 10% Pd/C was added to the solution and suspended therein. In a hydrogen atmosphere, the mixture was stirred overnight and then the Pd catalyst was removed by filtration. MeOH was distilled off under reduced pressure. After the residue was dissolved in 1.5 mL of 50% AcOH aqueous solution, linear density gradient elution (60 minutes) to A/B: 72.5/27.5-63.5/26.5 was performed at a flow rate of 15 mL/min using eluant A: 0.1% TFA-water and eluant B: 0.1% TFA-containing acetonitrile on preparative HPLC using YMC Pack R&D-ODS-5-B S-5, 120A column (30×250 mm). The fractions containing the product were collected and lyophilized to give 7.2 mg of white powders.

Mass spectrum (M+H)⁺ 1216.4 (calcd. 1216.7)

Elution time on HPLC: 20.2 mins.

Elution Conditions:

Column: SHISEIDO CAPCELL PAK C18 MGII (4.6×100 mm)

Eluant: Linear density gradient elution with eluants A/B=95/5-45/55, using eluant A: 0.1% TFA-water and eluant B: 0.1% TFA-containing acetonitrile (25 mins.)

Flow rate: 1.0 mL/min.

EXAMPLE 16 (Synthesis L): Production of des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Phe6T(CH₂CH₂)AzaGly7,Arg(Me)9,Trp10]MS10 (Compound No. 968)

In a nitrogen atmosphere, 21.9 mL (32.8 mmol) of a toluene solution of 1.5 M DIBAL-H was dropwise added to a toluene (150 mL) solution of 5.63 g (16.4 mmol) of Z-Phe-NMe(OMe) at −78° C. After stirring for 20 minutes at the same temperature, the reaction was stopped with 0.1 N HCl aqueous solution. The whole was extracted with diethyl ether and the organic layer was washed sequentially with 1 M HCl aqueous solution and satd. sodium chloride aqueous solution. After drying over anhydrous MgSO₄, the mixture was concentrated under reduced pressure to give the aldehyde as an oily substance. On the other hand, 3.57 mL (20.5 mmol) of DEA and 4.81 mL (20.5 mmol) of (EtO)₂P(O)CH₂CO₂Bu^(t) were sequentially added under ice cooling to a suspension of 869 mg (20.5 mmol) of anhydrous LiCl in acetonitrile (40 mL). The mixture was stirred at the same temperature for 20 minutes and then a solution of the aldehyde obtained above in acetonitrile (4 mL) was dropwise added. While elevating to room temperature, the mixture was stirred overnight. The whole was extracted with AcOEt and the organic layer was washed sequentially with satd. citric acid aqueous solution, satd. sodium bicarbonate aqueous solution and satd. sodium chloride aqueous solution, and then dried over anhydrous MgSO₄. After concentration under reduced pressure, flash chromatography was performed using AcOEt:n-hexane=1:8 to give 5.0 g of the α, β-unsaturated ester as white powders (79.9%). After 1.29 g (3.38 mmol) of the α, β-unsaturated ester was dissolved in 10 mL of TFA, the solution was stirred at room temperature for 1.5 hours. TFA was removed by distillation under reduced pressure and then azeotropically distilled off twice with toluene. The residue was dissolved in 15 mL of DMF, and 771 mg (5.07 mmol) of HOBt.NH₃ and 972 mg (5.07 mmol) of EDC.HCl were added, followed by stirring at room temperature overnight. The organic layer was washed sequentially with satd. citric acid aqueous solution, satd. sodium bicarbonate aqueous solution and satd. sodium chloride aqueous solution, and then dried over anhydrous MgSO₄. After concentration under reduced pressure, the residue was dissolved in 60 mL of MeOH and 10% Pd/C was added thereto, followed by stirring overnight in a hydrogen atmosphere. The Pd/C was removed by filtration through celite and the filtrate was concentrated under reduced pressure. The residue was dissolved in 6 mL of chloroform, and 589 μL (3.38 mmol) of DIEA and 738 mg (3.38 mmol) of Boc₂O were added thereto, followed by stirring at room temperature for 12 hours. The whole was extracted with AcOEt and the organic layer was washed sequentially with satd. citric acid aqueous solution, satd. sodium bicarbonate aqueous solution and satd. sodium chloride aqueous solution, and then dried over anhydrous MgSO₄. After concentration under reduced pressure, the obtained powders were recrystallized from AcOEt/n-hexane/diethyl ether to give 611 mg of the carboxylic acid amide as white powders (61.8%). After 200 mg (0.684 mmol) of the carboxylic acid amide was dissolved in THF, 111 μL (1.37 mmol) of pyridine and 589 mg of C₆H₅I(OCOCF₃)₂ were added to the solution. The mixture was then stirred at room temperature for 3 hours, and 477 μL (2.74 mmol) of DIEA and 307 mg (1.37 mmol) of HCl.H-Leu-OBu^(t) were sequentially added. The mixture was further stirred at room temperature overnight. The whole was extracted with AcOEt and the organic layer was washed sequentially with satd. citric acid aqueous solution, satd. sodium bicarbonate aqueous solution and satd. sodium chloride aqueous solution, and then dried over anhydrous MgSO₄. After concentration under reduced pressure, flash chromatography was performed using AcOEt:n-hexane=1:2 to give 200 mg of Boc-PheΨ(CH₂CH₂)AzGly-Leu-OBu^(t) as oily substance (61.1%). Then, 200 mg (0.419 mmol) of Boc-PheΨ(CH₂CH₂)AzGly-Leu-OBu^(t) was dissolved in 4 mL of TFA and the solution was stirred at room temperature for 1.5 hours. TFA was distilled off under reduced pressure and then distilled azeotropically twice. The residue obtained was dissolved in acetonitrile:H₂O (2:1, 4.5 mL). Under ice cooling, Et₃N was added until the solution became basic and 158 mg (0.419 mmol) of Fmoc-OSu was further added thereto. While elevating to room temperature, the mixture was stirred overnight. The whole was then extracted with AcOEt. H₂O was added to form the precipitate and the precipitate was taken up by filtration, washed sequentially with H₂O and n-hexane and dried under reduced pressure to give 250 mg of Fmoc-PheΨ(CH₂CH₂)AzaGly-Leu-OH.

After 86.5 mg (0.03 mmol) of Fmoc-Arg(Boc₂,Me)-Trp(Boc)-Rink Amide MBHA resin (0.347 mmol/g) was swollen in DMF, the mixture was treated with 20% piperidine/DMF solution to cleave the Fmoc group. Subsequently, the resin was treated in DMF with 65.2 mg (0.12 mmol) of Fmoc-PheΨ(CH₂CH₂)AzaGly-Leu-OH, 20.9 μl (0.12 mmol) of DIEA, 240 μl (0.12 mmol) of 0.5 M HOAt/DMF solution and 62.5 mg (0.12 mmol) of PyAOP at room temperature for 12 hours. After washing with DMF, the resin was treated with 20% piperidine/DMF solution to cleave the Fmoc group. Subsequently, the resin was treated in DMF with 66.2 mg (0.12 mmol) of Ac-D-Tyr-Hyp-Asn-Thr-OH, 20.9 μl (0.12 mmol) of DIEA, 240 μl (0.12 mmol) of 0.5 M HOAt/DMF solution and 62.5 mg (0.12 mmol) of PyAOP at room temperature for 7 hours to give Ac-D-Tyr-Hyp-Asn-Thr-PheΨ(CH₂CH₂)AzaGly-Leu-Arg(Boc₂,Me)-Trp(Boc)-Rink Amide MBHA resin. After the resin was washed with MeOH and dried, 1.5 mL of TFA/PhSMe/m-cresol/H₂O/TIS/EDT (80/5/5/5/2.5/2.5) was added and the mixture was stirred for 90 minutes. Diethyl ether was added to each reaction solution to give the precipitate and after centrifugation, the supernatant was removed; this procedure was repeated twice for washing. The residue was extracted with an aqueous acetic acid solution and the extract was filtered to remove the resin. Then, linear density gradient elution (60 minutes) to A/B: 73.5/26.5-63.5/36.5 was performed at a flow rate of 15 mL/min using eluant A: 0.1% TFA-water and eluant B: 0.1% TFA-containing acetonitrile on preparative HPLC using YMC Pack R&D-ODS-5-B S-5, 120A column (30×250 mm). The fractions containing the product were collected and lyophilized to give 3.6 mg of white powders.

Mass spectrum (M+H)⁺ 1210.3 (calcd. 1210.6)

Elution time on HPLC: 18.3 mins.

Elution Conditions:

Column: SHISEIDO CAPCELL PAK C18 MGII (4.6×100 mm)

Eluant: Linear density gradient elution with eluants A/B=95/5-45/55, using eluant A: 0.1% TFA-water and eluant B: 0.1% TFA-containing acetonitrile (25 mins.)

Flow rate: 1.0 mL/min.

The compounds synthesized in EXAMPLES 1 to 16 and the compounds synthesized by the procedures similar to EXAMPLES 1 to 16 are shown in TABLE 2 below, in terms of their structures, physicochemical properties, etc.

The description “Synthesis” in the table indicates that:

the compounds described in EXAMPLES 1-16 were synthesized by Synthesis A through G described at the column “Synthesis” of the respective compounds or the compounds described in EXAMPLES 1-16 can be synthesized by Synthesis A through G described at the column “Synthesis” of the respective compounds; and,

the compounds not described in EXAMPLES 1-16 were synthesized by a modification of the synthesis described in “Synthesis” for the respective compounds.

The description “HPLC condition” in the table indicates that:

the compounds described in EXAMPLES 1-16 can be eluted under the conditions by a, b, c or d described at the column “HPLC Conditions” for the respective compounds; and,

the compounds not described in EXAMPLES 1-16 were eluted under the conditions by a, b, c or d described at the column “HPLC Conditions” for the respective compounds.

TABLE 2 Com- HPLC Syn- pound M + H* M + H* HPLC condi- thesis number Structure (obs.) (cal.) (min.) tion method 796 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Arg(Me)9,Trp10]MS10 1224.6 1224.6 11.8 a A 803 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Ala7,Arg(Me)9,Trp10]MS10 1238.5 1238.6 12.0 a A 804 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Ser7,Arg(Me)9,Trp10]MS10 1254.4 1254.6 11.7 a A 811 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Aib7,Arg(Me)9,Trp10]MS10 1252.8 1252.6 12.2 a A 818 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Abu7,Arg(Me)9,Trp10]MS10 1252.7 1252.6 12.5 a A 822 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Cha6,Arg(Me)9,Trp10]MS10 1231.0 1230.7 13.4 a A 823 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Cha6,Ala7,Arg(Me)9,Trp10]MS10 1245.0 1244.7 13.3 a A 827 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Dap7,Arg(Me)9,Trp10]MS10 1254.0 1253.6 11.5 a A 828 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Ser(Me)7,Arg(Me)9,Trp10]MS10 1269.0 1268.6 12.3 a A 834 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Phe6Ψ(CH₂O)Gly7,Arg(Me)9,Trp10]MS10 1211.3 1211.6 19.4 b B 839 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Pya(2)6,Arg(Me)9,Trp10]MS10 1225.4 1225.6 7.6 a A 847 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Val7,Arg(Me)9,Trp10]MS10 1266.8 1266.7 19.2 b A 848 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Pya(3)6,Arg(Me)9,Trp10]MS10 1225.9 1225.6 7.5 a A 849 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Pya(4)6,Arg(Me)9,Trp10]MS10 1226.0 1225.6 7.3 a A 850 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Phe6Ψ(CH₂CH₂)Gly7,Arg(Me)9,Trp10]MS10 1209.7 1209.6 12.2 c C 851 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Phe6Ψ(COCH₂)Gly7,Arg(Me)9,Trp10]MS10 1224.2 1223.6 11.8 c D 852 des(1)-Ac-[D-Tyr2,Glu3,Thr5,Arg(Me)9,Trp10]MS10 1241.0 1240.6 12.1 a A 853 des(1)-Ac-[D-Tyr2,Glu3,Thr5,Cha6,Arg(Me)9,Trp10]MS10 1247.3 1246.7 13.4 a A 854 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Gly7Ψ(CH₂NH)Leu8,Arg(Me)9,Trp10]MS10 1210.6 1210.6 10.9 a E 855 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Ala(cPr)6,Arg(Me)9,Trp10]MS10 1188.8 1188.6 10.6 a A 857 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Phe6Ψ((S)CHOH—CH₂)Gly7,Arg(Me)9,Trp10]MS10 1226.2 1225.6 11.9 c F 858 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Phe6Ψ((S)CHOH—(E)CH=)Gly7,Arg(Me)9,Trp10]MS10 1224.2 1223.6 11.7 c C 859 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Phe6Ψ((E)CH═CH)Gly7,Arg(Me)9,Trp10]MS10 1208.1 1207.6 12.3 c C 866 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Phe6Ψ((R)CHOH—(E)CH=)Gly7,Arg(Me)9,Trp10]MS10 1224.2 1223.6 11.5 c C 867 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Phe6Ψ((R)CHOH—CH₂)Gly7,Arg(Me)9,Trp10]MS10 1226.3 1225.6 11.5 c F 869 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,αMePhe6,Arg(Me)9,Trp10]MS10 1239.0 1238.6 13.0 a A 871 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Phe(2Me)6,Arg(Me)9,Trp10]MS10 1238.6 1238.6 12.9 a A 873 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Phe(3Me)6,Arg(Me)9,Trp10]MS10 1238.7 1238.6 13.0 a A 875 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Phe(4Me)6,Arg(Me)9,Trp10]MS10 1238.5 1238.6 12.9 a A 885 des(1)-Ac-[D-Tyr2,Hyp3,Alb4,Thr5,Arg(Me)9,Trp10]MS10 1239.7 1239.6 12.2 a A 892 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Gly7Ψ((E)CH═CH)Leu8,Arg[(Me)9,Trp10]MS10 1207.5 1207.6 14.6 c G 893 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Gly7Ψ((E)CH₂CH₂)Leu8,Arg(Me)9,Trp10]MS10 1209.1 1209.6 19.0 d H 894 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Cha6,Ala(cPr)8,Arg(Me)9,Trp10]MS10 1228.9 1228.6 12.9 a A 895 des(1)-Ac-[D-Tyr2,Glu3,Thr5,Cha6,Ala(cPr)8,Arg(Me)9,Trp10]MS10 1244.8 1244.6 12.6 a A 902 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Cha6,Gly7Ψ((E)CH═CH)Leu8,Arg(Me)9,Trp10]MS10 1213.5 1213.7 20.2 d G 903 des(1)-Ac-[D-Tyr2,Hyp3,Alb4,Thr5,Cha6,Gly7Ψ((E)CH═CH)Leu8,Arg(Me)9,Trp10]MS10 1228.4 1228.7 20.2 d G 904 des(1)-Ac-[D-Tyr2,Glu3,Thr5,Cha6,Gly7Ψ((E)CH═CH)Leu8,Arg(Me)9,Trp10]MS10 1229.2 1229.7 20.5 d G 905 des(1)-Ac-[D-Tyr2,Glu3,Alb4,Thr5,Cha6,Gly7Ψ((E)CH═CH)Leu8,Arg(Me)9,Trp10]MS10 1244.3 1244.7 20.3 d G 906 des(1)-Ac-[D-Tyr2,Hyp3,Alb4,Gly7Ψ((E)CH═CH)Leu8,Arg(Me)9,Trp10]MS10 1222.6 1222.6 19.1 d G 907 des(1)-Ac-[D-Tyr2,Glu3,Thr5,Gly7Ψ((E)CH═CH)Leu8,Arg(Me)9,Trp10]MS10 1223.6 1223.6 19.1 d G 908 des(1)-Ac-[D-Tyr2,Glu3,Alb4,Thr5,Gly7Ψ((E)CH═CH)Leu8,Arg(Me)9,Trp10]MS10 1238.7 1238.6 19.3 d G 909 des(1)-Ac-[D-Tyr2,Asp3,Thr5,Cha6,Ala(cPr)8,Arg(Me)9,Trp10]MS10 1230.7 1230.6 12.0 a A 910 des(1)-Ac-[D-Tyr2,Aad3,Thr5,Cha6,Ala(cPr)8,Arg(Me)9,Trp10]MS10 1258.6 1258.7 12.4 a A 911 des(1)-Ac-[D-Tyr2,Lys3,Thr5,Cha6,Ala(cPr)8,Arg(Me)9,Trp10]MS10 1243.6 1243.7 10.9 a A 912 des(1)-Ac-[D-Tyr2,Aib3,Thr5,Cha6,Ala(cPr)8,Arg(Me)9,Trp10]MS10 1200.6 1200.7 13.9 a A 913 des(1)-Ac-[D-Tyr2,Hyp3,Gln4,Thr5,Cha6,Gly7Ψ((E)CH═CH)Leu8,Arg(Me)9,Trp10]MS10 1227.5 1227.7 20.2 d G 914 des(1)-Ac-[D-Tyr2,Hyp3,Cit4,Thr5,Cha6,Gly7Ψ((E)CH═CH)Leu8,Arg(Me)9,Trp10]MS10 1256.2 1256.7 19.9 d G 915 des(1)-Ac-[D-Tyr2,Hyp3,Glu4,Thr5,Cha6,Gly7Ψ((E)CH═CH)Leu8,Arg(Me)9,Trp10]MS10 1228.4 1228.7 20.7 d G 916 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Ala(cPr)8,Arg(Me)9,Trp10]MS10 1222.5 1222.6 10.8 a A 917 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Ser(Me)8,Arg(Me)9,Trp10]MS10 1212.4 1212.6 9.3 a A 918 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Nva8,Arg(Me)9,Trp10]MS10 1210.1 1210.6 10.6 a A 919 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Nal(2)6,Arg(Me)9,Trp10]MS10 1274.1 1274.6 13.6 a A 920 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Cha6,Ser(Me)8,Arg(Me)9,Trp10]MS10 1218.3 1218.6 10.8 a A 921 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Cha6,Nva8,Arg(Me)9,Trp10]MS10 1216.5 1216.6 12.0 a A 923 des(1)-Ac-[D-Tyr2,Glu3,Thr5,Cha6,Ser(Me)8,Arg(Me)9,Trp10]MS10 1234.6 1234.6 10.4 a A 924 des(1)-Ac-[D-Tyr2,Glu3,Thr5,Cha6,Nva8,Arg(Me)9,Trp10]MS10 1232.6 1232.6 12.0 a A 925 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Gly7Ψ((E)CH═CH)Leu8,Trp10]MS10 1193.6 1193.6 19.0 d G 926 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Cha6,Gly7Ψ((E)CH═CH)Leu8,Trp10]MS10 1199.6 1199.7 20.2 d G 927 des(1)-Ac-[D-Tyr2,Hyp3,Alb4,Thr5,Cha6,Gly7Ψ((E)CH═CH)Leu8,Trp10]MS10 1214.6 1214.7 20.1 d G 929 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Gly7Ψ(CH₂S)Leu8,Arg(Me)9,Trp10]MS10 1227.0 1227.6 19.5 d I 931 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Cha6,Gly7Ψ(CH₂S)Leu8,Arg(Me)9,Trp10]MS10 1233.4 1233.6 20.7 d I 932 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Cha6,Nle8,Arg(Me)9,Trp10]MS10 1230.6 1230.7 12.9 a A 933 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Cha6,Leu(Me)8,Arg(Me)9,Trp10]MS10 1244.6 1244.7 13.3 a A 934 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Cha6,8,Arg(Me)9,Trp10]MS10 1270.5 1270.7 14.8 a A 940 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Cha6,Ala(cPr)8,Trp10]MS10 1214.1 1214.6 12.2 a A 942 des(1)-Ac-[D-Tyr2,Glu3,Thr5,Cha6,Ala(cPr)8,Trp10]MS10 1230.4 1230.6 12.4 a A 944 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Phe6Ψ(CH₂S)Gly7,Arg(Me)9,Trp10]MS10 1227.6 1227.6 19.0 d J 945 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Ala(cBu)6,Ala(cPr)8,Arg(Me)9,Trp10]MS10 1200.7 1200.6 10.5 a A 946 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Cha6,Ala(cBu)8,Arg(Me)9,Trp10]MS10 1242.8 1242.7 13.2 a A 947 des(1)-Ac-[D-Tyr2,Hyp3,Alb4,Ala5,Cha6,Ala(cPr)8,Arg(Me)9,Trp10]MS10 1213.7 1213.7 12.7 a A 948 des(1)-Ac-[D-Tyr2,Hyp3,Alb4,Ser5,Cha6,Ala(cPr)8,Arg(Me)9,Trp10]MS10 1229.7 1229.6 12.1 a A 949 des(1)-Ac-[D-Tyr2,Hyp3,Alb4,Gly5,Cha6,Ala(cPr)8,Arg(Me)9,Trp10]MS10 1199.8 1199.6 12.1 a A 951 des(1)-Ac-[D-Tyr2,Hyp3,Alb4,Dap5,Cha6,Ala(cPr)8,Arg(Me)9,Trp10]MS10 1228.8 1228.7 10.6 a A 952 des(1)-Ac-[D-Tyr2,Hyp3,Alb4,Thr5,Cha6,Gly7Ψ(CH₂CH₂)Leu8,Trp10]MS10 1216.4 1216.7 20.2 d K 953 des(1)-Ac-[D-Tyr2,Hyp3,Alb4,Thr5,Cha6,Ala(cPr)8,Arg(Me)9,Trp10]MS10 1243.8 1243.7 10.6 a A 956 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Cha6,Gly7Ψ(CH₂CH₂)Leu8,Trp10]MS10 1201.6 1201.7 20.2 d K 957 des(1)-Ac-[D-Tyr2,Hyp3,Alb4,Thr5,Cha6,Gly7Ψ(CH₂CH₂)Leu8,Arg(Me)9,Trp10]MS10 1230.7 1230.7 20.3 d K 959 des(1)-Ac-[D-Tyr2,Pro(4F)3,Thr5,Cha6,Ala(cPr)8,Arg(Me)9,Trp10]MS10 1230.7 1230.6 11.8 a A 968 des(1)-Ac-[D-Tyr2,Hyp3,Thr5,Phe6Ψ(CH₂CH₂)AzaGly7,Arg(Me)9,Trp10)MS10 1210.3 1210.6 18.3 d L a: 20-70% AcCN/25 min. flow 1 ml/min. YMC_ODS AM-301 (4.6 × 100 mm) b: 0-50% AcCN/25 min. flow 1 ml/min. Wakosil-II 5C18 HG (4.6 × 100 mm) c: 20-70% AcCN/25 min flow 1 ml/min SHISEIDO CAPCELL PAK C18 MGII (4.6 × 100 mm) d: 5-55% AcCN/25 min flow 1 ml/min SHISEIDO CAPCELL PAK C18 MGII (4.6 × 100 mm)

TEST EXAMPLE 1 Measurement of Agonist Activity by Assaying Changes in Intracellular Calcium Ion Level

1) Preparation of Human Metastin and Rat Metastin Stable Expression Cell Lines

Human metastin and rat metastin stable expression cell lines were obtained by transfecting the expression plasmid for animal cells into CHO/dhfr⁻ cells using CellPhect Transfection Kit (manufactured by GE Healthcare). First, 240 μL of Buffer A (attached to CellPhect Transfection Kit) was added to 9.6 μg of plasmid DNA dissolved in 240 μL of distilled water followed by stirring. After the mixture was settled for 10 minutes, 480 μL of Buffer B (attached to CellPhect Transfection Kit) was added to the mixture, which was vigorously stirred to form liposomes containing the DNA. Then, 4×10⁵ CHO/dhfr⁻ cells (obtained from ATCC) were inoculated on a 60 mm Petri dish. After culturing the cells in Ham's F-12 medium (manufactured by Nissui Seiyaku Co., Ltd.) supplemented with 10% fetal bovine serum (manufactured by BIO WHITTAKER, Inc.) at 37° C. for 2 days in 5% carbon dioxide gas, 480 mL of the liposomes were dropwise added to the cells on the Petri dish. After culturing the cells in a CO₂ incubator (5% CO₂, 37° C.) for 6 hours, the cells were washed twice with serum-free Ham's F-12 medium and 3 mL of 15% glycerol was added to the cells on the Petri dish followed by treatment for 2 minutes. The cells were again washed twice with serum-free Ham's F-12 medium followed by incubation in Ham's F-12 medium supplemented with 10% fetal bovine serum in a CO₂ incubator (5% CO₂, 37° C.) for 15 hours. The cells were dispersed by trypsin treatment to recover from the Petri dish. The recovered cells were inoculated on a 6-well plate in 1.25×10⁴ cells each/well and incubation was initiated in a CO₂ incubator (5% CO₂, 37° C.) in Dulbecco's modified Eagle medium (DMEM, manufactured by Nissui Seiyaku) containing 10% dialyzed fetal bovine serum (manufactured by JRH BIOSCIENCES, Inc.). The plasmid-transfected CHO transformants grew in the medium but the non-transfected cells gradually died, accordingly the medium was exchanged on Days 1 and 2 after the initiation of incubation to remove the dead cells. Approximately 20 colonies of the CHO transformants that kept growing on Days 8 to 10 after the incubation were isolated. From the cells in these colonies, cells showing high reactivity with the ligand peptide metastin (hereinafter merely referred to as h175 KB19 and h175 KB29 strains) were selected to provide for the following experiment.

2) Cell Seeding

Human metastin expression CHO cell line (h175 KB19 strain is described in a separate section) and rat metastin expression CHO cell line (h175 KB29 strain is described in a separate section) were seeded in a 96-well plate (type 3904, manufactured by Corning) at 3×10⁴ cells/well, followed by incubation in a CO₂ incubator (5% CO₂, 37° C.) for 24 hours. For the medium, MEMα medium (nucleic acid-free, manufactured by Nikken Bio Medical Laboratory) supplemented with dialyzed 10% fetal bovine serum (manufactured by Thermo, MultiSer) was used.

3) Loading with Fluo-4 NW in Cells

As an assay buffer, 1× Hanks' balanced salt solution (HBSS, manufactured by GIBCO) supplemented with 0.1% BSA, 20 mM HEPES (pH 7.4, manufactured by GIBCO) and 1 mM Probenecid (manufactured by Molecular Probes) was prepared. The medium in the wells of the cell-seeded plate was removed and 100 μL each of the assay buffer (kept warm at 37° C.) was added to each well. After 10 mL of the assay buffer (the volume for assaying two plates) was charged in one Fluo-4NW dye mix (Component A, Fluo-4 NW calcium assay kit (starter pack), manufactured by Molecular Probes) bottle, the mixture was gently stirred to prepare the Fluo-4 NW loading solution. This loading solution was charged in each well by 50 μl each and reacted in a CO₂ incubator (5% CO₂, 37° C.) for 30 minutes for loading with Fluo-4 NW into the cells. Subsequently, the cells were settled at room temperature (25° C.) for 15 minutes and then used for assay.

4) Measurement of Agonist Activity

To monitor the agonist activity of a test compound, the test compound diluted in the assay buffer described above was dispensed into a 96-well plate (type 3363, manufactured by Corning) by 80 μl each/well to prepare the compound plate. Fluo-4 NW-loaded cell plate and compound plate were set on a Fluorometric Imaging Plate Reader (FLIPR, manufactured by Molecular Devices) and 50 μl each was dispensed in each well through an automated pipettor in the FLIPR. The agonist response when stimulated with the compound was monitored via CCD camera in the FLIPR in terms of changes in intracellular calcium ion levels (changes in fluorescence of Fluo-4 NW).

Human Metastin (45-54)* specific agonist activity refers to the value obtained by subtracting the fluorescence change in the control group without any additive from the fluorescence change induced by Metastin (45-54). The specific agonist activity of a test compound refers to the value obtained by subtracting the fluorescence change observed in the control group in the absence of any test compound from the fluorescence change observed when added with the test compound. The compound level showing the 50% agonist response activity (EC₅₀ value) was calculated from the dose-response curve. When the maximum response of human Metastin (45-54) specific agonist activity was made 100%, the EC₅₀ was calculated on a test compound showing 70% or more of the maximum activity as compared to the maximum response.

*Peptide used and synthesized from the 45th to 54th in the amino acid sequence for human metastin [human Metastin (45-54)] is the synthetic product from Peptide Institute, Inc.

The agonist activity of each test compound [expressed by the specific activity of the EC₅₀ of a test compound based on the EC₅₀ of Metastin (45-54)] is shown in TABLE 3. The data reveal that the compounds of the present invention have excellent agonist activities on the metastin receptors.

TABLE 3 Compound No. Specific Activity 796 1.2 803 0.5 804 0.6 811 1.5 818 1.0 822 0.3 823 0.5 827 1.3 828 1.2 834 0.5 839 1.2 847 1.7 848 0.9 849 0.9 850 1.3 851 1.1 852 0.5 853 0.6 854 2.9 855 1.9 857 1.2 858 1.7 859 0.7 866 1.4 867 0.8 869 3.8 871 0.7 873 0.8 875 0.9 885 0.5 892 0.6 893 0.8 894 0.5 895 0.4 902 0.6 903 0.4 904 0.5 905 0.5 906 0.6 907 0.6 908 0.5 909 2.5 910 1.1 911 0.7 912 0.6 913 1.4 914 0.9 915 4.6 916 0.8 917 0.8 918 0.7 919 1.0 920 0.5 921 0.5 923 0.5 924 0.4 925 0.4 926 0.6 927 0.5 929 1.2 931 1.7 932 0.6 933 1.4 934 3.5 940 0.5 942 0.4 944 0.7 945 0.7 946 0.5 947 0.5 948 0.5 949 0.7 951 0.7 952 1.3 953 0.5 956 1.1 957 1.1 959 0.4 968 0.6

TEST EXAMPLE 2 Evaluation of Blood Testosterone Level Reducing Effect of Metastin Peptide Derivatives Using Mature Male Rats

In the metastin peptide derivatives listed in TABLES 1 and 2, the blood testosterone level reducing effects were evaluated on the compounds except for compound Nos. 828, 847, 854, 857, 866, 869, 915, 917 and 934.

A metastin peptide derivative (hereinafter referred to as peptide) was dissolved in 50% DMSO aqueous solution (DMSO: Sigma-Aldrich, distilled water for injection: Otsuka Pharmaceutical) to prepare a peptide solution with the concentration of 0.1, 0.03 or 0.01 mM. This peptide solution was filled in five ALZET osmotic pumps (Model 2001, 0.2 mL in volume, release rate: 0.001 mL/hr, DURECT Corporation). The ALZET pump filled with the peptide solution was implanted subcutaneously in 5 CD(SD)IGS male rats of 9 weeks old after birth (Charles River Japan, Inc.) on the back under ethereal anesthesia by one pump/animal. For negative control, 50% DMSO aqueous solution was filled in 5 ALZET osmotic pumps, which were similarly implanted in 5 male CD(SD)IGS rats (Charles River Japan, Inc.), respectively. These rats were fed for 6 days under normal feeding conditions. After weighing, the animal was decapitated to collect blood. After 0.03 mL/mL blood of aprotinin (Trasylol, Bayer) solution containing 0.1 g/mL EDTA.2Na was added to blood, the plasma was separated and recovered by centrifugation at 1,800×g for 30 minutes. From the plasma obtained, 0.05 mL was applied to radioimmunoassay (DPC Total Testosterone Kit, Diagnostic Products Corporation) to measure the plasma testosterone level in each rat. The peptides are listed in TABLE 4, when the number of rats showing the testosterone level below the measurement limit (0.04 ng/mL of plasma level) in radioimmunoassay was 3 or more in the 5 rats receiving the peptides.

TABLE 4 Compound No. 822 853 892 894 895 902 903 904 905 907 910 912 924 925 926 927 931 956 957 959

INDUSTRIAL APPLICABILITY

According to the present invention, there are provided stable metastin derivatives having excellent biological activities (a cancer metastasis suppressing activity, a cancer growth suppressing activity, a gonadotropic hormone secretion stimulating activity, sex hormone secretion stimulating activity, a gonadotropic hormone secretion suppressing activity, sex hormone secretion suppressing activity, etc.). 

1. A compound selected from the group consisting of: Ac-D-Tyr-Hyp-Asn-Thr-Cha-Gly-Ala(cPr)-Arg(Me)-Trp-NH₂, Ac-D-Tyr-Hyp-Asn-Thr-Cha-Glyψ((E)CH═CH)Leu-Arg(Me)-Trp-NH₂, Ac-D-Tyr-Hyp-Alb-Thr-Cha-Glyψ((E)CH═CH)Leu-Arg(Me)-Trp-NH₂, Ac-D-Tyr-Hyp-Asn-Thr-Cha-Glyψ((E)CH═CH)Leu-Arg-Trp-NH₂, Ac-D-Tyr-Hyp-Alb-Thr-Cha-Glyψ((E)CH═CH)Leu-Arg-Trp-NH₂, Ac-D-Tyr-Hyp-Alb-Thr-Cha-Gly-Ala(cPr)-Arg(Me)-Trp-NH₂ and Ac-D-Tyr-Pro(4F)-Asn-Thr-Cha-Gly-Ala(cPr)-Arg(Me)-Trp-NH₂, or a salt thereof, wherein Hyp is trans-4-hydroxyproline, Cha is cyclohexylalanine, Ala(cPr) is cyclopropylalanine, Arg(Me) is N^(ω)-methylarginine, Glyψ((E)CH═CH)Leu is Gly-Leu wherein the CONH between Gly and Leu is substituted with (E) type alkene, Alb is 2-amino-3-ureidopropionic acid, and Pro(4F) is trans-4-fluoroproline.
 2. A Compound according to claim 1, wherein said compound is Ac-D-Tyr-Hyp-Asn-Thr-Cha-Gly-Ala(cPr)-Arg(Me)-Trp-NH₂ or a salt thereof.
 3. A Compound according to claim 1, wherein said compound is Ac-D-Tyr-Hyp-Asn-Thr-Cha-GlyΨ((E)CH═CH)Leu-Arg(Me)-Trp-NH₂ or a salt thereof.
 4. A Compound according to claim 1, wherein said compound is Ac-D-Tyr-Hyp-Alb-Thr-Cha-GlyΨ((E)CH═CH)Leu-Arg(Me)-Trp-NH₂ or a salt thereof.
 5. A Compound according to claim 1, wherein said compound is Ac-D-Tyr-Hyp-Asn-Thr-Cha-GlyΨ((E)CH═CH)Leu-Arg-Trp-NH₂ or a salt thereof.
 6. A Compound according to claim 1, wherein said compound is Ac-D-Tyr-Hyp-Alb-Thr-Cha-GlyΨ((E)CH═CH)Leu-Arg-Trp-NH₂ or a salt thereof.
 7. A Compound according to claim 1, wherein said compound is Ac-D-Tyr-Hyp-Alb-Thr-Cha-Gly-Ala(cPr)-Arg(Me)-Trp-NH₂ or a salt thereof.
 8. A Compound according to claim 1, wherein said compound is Ac-D-Tyr-Pro(4F)-Asn-Thr-Cha-Gly-Ala(cPr)-Arg(Me)-Trp-NH₂ or a salt thereof.
 9. A medicament comprising a compound of claim 1 or a salt thereof. 